diff --git a/packages/react-native/ReactCommon/react/renderer/debug/CMakeLists.txt b/packages/react-native/ReactCommon/react/renderer/debug/CMakeLists.txt
index 165a79e5c53f2a..a1fccffe2bf8d6 100644
--- a/packages/react-native/ReactCommon/react/renderer/debug/CMakeLists.txt
+++ b/packages/react-native/ReactCommon/react/renderer/debug/CMakeLists.txt
@@ -15,3 +15,10 @@ target_include_directories(react_renderer_debug PUBLIC ${REACT_COMMON_DIR})
 target_link_libraries(react_renderer_debug folly_runtime react_debug)
 target_compile_reactnative_options(react_renderer_debug PRIVATE)
 target_compile_options(react_renderer_debug PRIVATE -Wpedantic)
+
+# Enable debug string convertible for Debug builds or when explicitly requested
+# This allows getRenderedOutput() to include props in tests
+# Set RN_ENABLE_DEBUG_STRING_CONVERTIBLE=ON to enable for Release builds
+if(${CMAKE_BUILD_TYPE} MATCHES Debug OR RN_ENABLE_DEBUG_STRING_CONVERTIBLE)
+  target_compile_definitions(react_renderer_debug PUBLIC RN_ENABLE_DEBUG_STRING_CONVERTIBLE)
+endif()
diff --git a/packages/react-native/ReactCommon/react/renderer/debug/flags.h b/packages/react-native/ReactCommon/react/renderer/debug/flags.h
index f7e2002f920287..4fd6f16eaaa0d7 100644
--- a/packages/react-native/ReactCommon/react/renderer/debug/flags.h
+++ b/packages/react-native/ReactCommon/react/renderer/debug/flags.h
@@ -29,8 +29,9 @@
 // #define RN_SHADOW_TREE_INTROSPECTION 1
 
 // This enables certain object-to-string debug conversions to be compiled.
-// Enable if `REACT_NATIVE_DEBUG` is enabled.
-#ifdef REACT_NATIVE_DEBUG
+// Enable if either `REACT_NATIVE_DEBUG` or `RN_ENABLE_DEBUG_STRING_CONVERTIBLE`
+// is defined
+#if defined(REACT_NATIVE_DEBUG) || defined(RN_ENABLE_DEBUG_STRING_CONVERTIBLE)
 #define RN_DEBUG_STRING_CONVERTIBLE 1
 #else
 #define RN_DEBUG_STRING_CONVERTIBLE 0
diff --git a/private/react-native-fantom/build.gradle.kts b/private/react-native-fantom/build.gradle.kts
index d40e66f97c2939..3bf026783050ee 100644
--- a/private/react-native-fantom/build.gradle.kts
+++ b/private/react-native-fantom/build.gradle.kts
@@ -188,6 +188,7 @@ val configureFantomTester by
               "-DREACT_COMMON_DIR=$reactNativeDir/ReactCommon",
               "-DREACT_CXX_PLATFORM_DIR=$reactNativeDir/ReactCxxPlatform",
               "-DREACT_THIRD_PARTY_NDK_DIR=$reactAndroidBuildDir/third-party-ndk",
+              "-DRN_ENABLE_DEBUG_STRING_CONVERTIBLE=ON",
           )
       commandLine(cmdArgs)
       standardOutputFile.set(project.file("$buildDir/reports/configure-fantom_tester.log"))
diff --git a/private/react-native-fantom/runner/executables/hermesc.js b/private/react-native-fantom/runner/executables/hermesc.js
index 9d43d643be7322..d53ee02c8a8a07 100644
--- a/private/react-native-fantom/runner/executables/hermesc.js
+++ b/private/react-native-fantom/runner/executables/hermesc.js
@@ -15,6 +15,7 @@ import {NATIVE_BUILD_OUTPUT_PATH} from '../paths';
 import {
   getBuckModesForPlatform,
   getBuckOptionsForHermes,
+  getConfigForAnimationBackend,
   getDebugInfoFromCommandResult,
   getHermesCompilerTarget,
   runBuck2Sync,
@@ -23,23 +24,23 @@ import {
 import fs from 'fs';
 import path from 'path';
 
-type TesterOptions = $ReadOnly<{
-  isOptimizedMode: boolean,
+type HermescOptions = $ReadOnly<{
+  enableCoverage: boolean,
+  enableRelease: boolean,
   hermesVariant: HermesVariant,
 }>;
 
-function getHermesCompilerPath({
-  isOptimizedMode,
+function getHermescPath({
+  enableRelease,
   hermesVariant,
-}: TesterOptions): string {
+}: HermescOptions): string {
   return path.join(
     NATIVE_BUILD_OUTPUT_PATH,
-    `hermesc-${(hermesVariant as string).toLowerCase()}-${isOptimizedMode ? 'opt' : 'dev'}`,
+    `hermesc-${(hermesVariant as string).toLowerCase()}-${enableRelease ? 'opt' : 'dev'}`,
   );
 }
-
-export function build(options: TesterOptions): void {
-  const destPath = getHermesCompilerPath(options);
+export function build(options: HermescOptions): void {
+  const destPath = getHermescPath(options);
   if (fs.existsSync(destPath)) {
     return;
   }
@@ -49,8 +50,12 @@ export function build(options: TesterOptions): void {
   try {
     const result = runBuck2Sync([
       'build',
-      ...getBuckModesForPlatform(options.isOptimizedMode),
+      ...getBuckModesForPlatform({
+        enableRelease: options.enableRelease,
+        enableCoverage: options.enableCoverage,
+      }),
       ...getBuckOptionsForHermes(options.hermesVariant),
+      ...getConfigForAnimationBackend(),
       getHermesCompilerTarget(options.hermesVariant),
       '--out',
       tmpPath,
@@ -75,11 +80,11 @@ export function build(options: TesterOptions): void {
 
 export function run(
   args: $ReadOnlyArray<string>,
-  options: TesterOptions,
+  options: HermescOptions,
 ): SyncCommandResult {
   if (!isCI) {
     build(options);
   }
 
-  return runCommandSync(getHermesCompilerPath(options), args);
+  return runCommandSync(getHermescPath(options), args);
 }
diff --git a/private/react-native-fantom/runner/executables/tester.js b/private/react-native-fantom/runner/executables/tester.js
index 2e173a41de9d48..ce5a32794fccc9 100644
--- a/private/react-native-fantom/runner/executables/tester.js
+++ b/private/react-native-fantom/runner/executables/tester.js
@@ -28,17 +28,18 @@ const FANTOM_TESTER_BUCK_TARGET =
   'fbsource//xplat/js/react-native-github/private/react-native-fantom/tester:tester';
 
 type TesterOptions = $ReadOnly<{
-  isOptimizedMode: boolean,
+  enableCoverage: boolean,
+  enableRelease: boolean,
   hermesVariant: HermesVariant,
 }>;
 
 function getFantomTesterPath({
-  isOptimizedMode,
   hermesVariant,
+  ...options
 }: TesterOptions): string {
   return path.join(
     NATIVE_BUILD_OUTPUT_PATH,
-    `fantom-tester-${(hermesVariant as string).toLowerCase()}-${isOptimizedMode ? 'opt' : 'dev'}`,
+    `fantom-tester-${(hermesVariant as string).toLowerCase()}-${options.enableRelease ? 'opt' : 'dev'}`,
   );
 }
 
@@ -51,15 +52,23 @@ export function build(options: TesterOptions): void {
   const tmpPath = destPath + '-' + Date.now();
 
   try {
-    const result = runBuck2Sync([
-      'build',
-      ...getBuckModesForPlatform(options.isOptimizedMode),
-      ...getBuckOptionsForHermes(options.hermesVariant),
-      ...getConfigForAnimationBackend(),
-      FANTOM_TESTER_BUCK_TARGET,
-      '--out',
-      tmpPath,
-    ]);
+    const result = runBuck2Sync(
+      [
+        'build',
+        ...getBuckModesForPlatform({
+          enableRelease: options.enableRelease,
+          enableCoverage: options.enableCoverage,
+        }),
+        ...getBuckOptionsForHermes(options.hermesVariant),
+        ...getConfigForAnimationBackend(),
+        FANTOM_TESTER_BUCK_TARGET,
+        '--out',
+        tmpPath,
+      ],
+      {
+        withFDB: false,
+      },
+    );
 
     if (result.status !== 0) {
       throw new Error(getDebugInfoFromCommandResult(result));
@@ -94,7 +103,10 @@ export function run(
     return runBuck2(
       [
         'run',
-        ...getBuckModesForPlatform(options.isOptimizedMode),
+        ...getBuckModesForPlatform({
+          enableRelease: options.enableRelease,
+          enableCoverage: options.enableCoverage,
+        }),
         ...getBuckOptionsForHermes(options.hermesVariant),
         ...getConfigForAnimationBackend(),
         FANTOM_TESTER_BUCK_TARGET,
diff --git a/private/react-native-fantom/runner/global-setup/build.js b/private/react-native-fantom/runner/global-setup/build.js
index 929984ab0eb435..647cef09ad20aa 100644
--- a/private/react-native-fantom/runner/global-setup/build.js
+++ b/private/react-native-fantom/runner/global-setup/build.js
@@ -37,7 +37,7 @@ async function tryOrLog(
   }
 }
 
-export default async function build(): Promise<void> {
+export default async function build(enableCoverage: boolean): Promise<void> {
   try {
     fs.rmSync(NATIVE_BUILD_OUTPUT_PATH, {recursive: true});
   } catch {}
@@ -45,10 +45,10 @@ export default async function build(): Promise<void> {
   fs.mkdirSync(NATIVE_BUILD_OUTPUT_PATH, {recursive: true});
 
   if (isCI) {
-    for (const isOptimizedMode of [false, true]) {
+    for (const enableRelease of [false, true]) {
       for (const hermesVariant of HermesVariant.members()) {
-        buildFantomTester({isOptimizedMode, hermesVariant});
-        buildHermesCompiler({isOptimizedMode, hermesVariant});
+        buildFantomTester({enableRelease, hermesVariant, enableCoverage});
+        buildHermesCompiler({enableRelease, hermesVariant, enableCoverage});
       }
     }
 
diff --git a/private/react-native-fantom/runner/global-setup/globalSetup.js b/private/react-native-fantom/runner/global-setup/globalSetup.js
index d357d839ad5370..6cd629388c8380 100644
--- a/private/react-native-fantom/runner/global-setup/globalSetup.js
+++ b/private/react-native-fantom/runner/global-setup/globalSetup.js
@@ -19,7 +19,10 @@ import {Server} from 'net';
 import path from 'path';
 
 export default async function globalSetup(
-  globalConfig: {...},
+  globalConfig: {
+    collectCoverage: boolean,
+    ...
+  },
   projectConfig: {...},
 ): Promise<void> {
   process.env.__FANTOM_RUN_ID__ ??= `run-${Date.now()}`;
@@ -29,7 +32,7 @@ export default async function globalSetup(
   await startMetroServer();
 
   if (!isOSS) {
-    await build();
+    await build(globalConfig.collectCoverage);
   }
 }
 
diff --git a/private/react-native-fantom/runner/paths.js b/private/react-native-fantom/runner/paths.js
index 43bacc1d7c5a01..f78b726f7a4364 100644
--- a/private/react-native-fantom/runner/paths.js
+++ b/private/react-native-fantom/runner/paths.js
@@ -30,6 +30,8 @@ export const JS_HEAP_SNAPSHOTS_OUTPUT_PATH: string = path.join(
   'js-heap-snapshots',
 );
 
+export const COVERAGE_OUTPUT_PATH: string = path.join(OUTPUT_PATH, 'coverage');
+
 export function getTestBuildOutputPath(): string {
   const fantomRunID = process.env.__FANTOM_RUN_ID__;
   if (fantomRunID == null) {
@@ -41,6 +43,16 @@ export function getTestBuildOutputPath(): string {
   return path.join(JS_BUILD_OUTPUT_PATH, fantomRunID);
 }
 
+export function getCoverageFilePath(): string {
+  const fantomRunID = process.env.__FANTOM_RUN_ID__;
+  if (fantomRunID == null) {
+    throw new Error(
+      'Expected Fantom run ID to be set by global setup, but it was not (process.env.__FANTOM_RUN_ID__ is null)',
+    );
+  }
+  return `${COVERAGE_OUTPUT_PATH}/${fantomRunID}.profraw`;
+}
+
 export function buildJSTracesOutputPath({
   testPath,
   testConfig,
diff --git a/private/react-native-fantom/runner/runner.js b/private/react-native-fantom/runner/runner.js
index 1291f6843317c5..6a3fbca73a9459 100644
--- a/private/react-native-fantom/runner/runner.js
+++ b/private/react-native-fantom/runner/runner.js
@@ -32,6 +32,7 @@ import {run as runFantomTester} from './executables/tester';
 import formatFantomConfig from './formatFantomConfig';
 import getFantomTestConfigs from './getFantomTestConfigs';
 import {
+  COVERAGE_OUTPUT_PATH,
   JS_HEAP_SNAPSHOTS_OUTPUT_PATH,
   JS_TRACES_OUTPUT_PATH,
   buildJSHeapSnapshotsOutputPathTemplate,
@@ -66,6 +67,8 @@ if (EnvironmentOptions.profileJS) {
   fs.mkdirSync(JS_TRACES_OUTPUT_PATH, {recursive: true});
 }
 
+fs.mkdirSync(COVERAGE_OUTPUT_PATH, {recursive: true});
+
 function buildError(
   failureDetail: FailureDetail,
   sourceMapPath: string,
@@ -163,18 +166,20 @@ async function processRNTesterCommandResult(
 function generateBytecodeBundle({
   sourcePath,
   bytecodePath,
-  isOptimizedMode,
+  enableRelease,
   hermesVariant,
+  enableCoverage,
 }: {
-  sourcePath: string,
   bytecodePath: string,
-  isOptimizedMode: boolean,
+  enableCoverage: boolean,
+  enableRelease: boolean,
   hermesVariant: HermesVariant,
+  sourcePath: string,
 }): void {
   const hermesCompilerCommandResult = runHermesCompiler(
     [
       '-emit-binary',
-      isOptimizedMode ? '-O' : null,
+      enableRelease ? '-O' : null,
       '-max-diagnostic-width',
       '80',
       '-out',
@@ -182,8 +187,9 @@ function generateBytecodeBundle({
       sourcePath,
     ].filter(Boolean),
     {
-      isOptimizedMode,
+      enableRelease,
       hermesVariant,
+      enableCoverage,
     },
   );
 
@@ -335,6 +341,12 @@ module.exports = async function runTest(
       path.basename(testJSBundlePath, '.js') + '.map',
     );
 
+    const collectCoverage = shouldCollectCoverage(
+      testPath,
+      testContents,
+      globalConfig,
+    );
+
     const bundleOptions = {
       testPath,
       entry: entrypointPath,
@@ -344,11 +356,7 @@ module.exports = async function runTest(
       sourceMap: true,
       sourceMapUrl: sourceMapPath,
       customTransformOptions: {
-        collectCoverage: shouldCollectCoverage(
-          testPath,
-          testContents,
-          globalConfig,
-        ),
+        collectCoverage,
       },
     };
 
@@ -361,7 +369,8 @@ module.exports = async function runTest(
       generateBytecodeBundle({
         sourcePath: testJSBundlePath,
         bytecodePath: testBytecodeBundlePath,
-        isOptimizedMode: testConfig.isJsOptimized,
+        enableCoverage: collectCoverage,
+        enableRelease: testConfig.isJsOptimized,
         hermesVariant: testConfig.hermesVariant,
       });
     }
@@ -388,8 +397,9 @@ module.exports = async function runTest(
           rnTesterCommandArgs,
         )
       : runFantomTester(rnTesterCommandArgs, {
-          isOptimizedMode: testConfig.isNativeOptimized,
+          enableRelease: testConfig.isNativeOptimized,
           hermesVariant: testConfig.hermesVariant,
+          enableCoverage: collectCoverage,
         });
 
     const [processedResult, benchmarkResult] =
diff --git a/private/react-native-fantom/runner/utils.js b/private/react-native-fantom/runner/utils.js
index 495b2e5ecacc9a..ea2b4bd4c7d446 100644
--- a/private/react-native-fantom/runner/utils.js
+++ b/private/react-native-fantom/runner/utils.js
@@ -9,6 +9,7 @@
  */
 
 import * as EnvironmentOptions from './EnvironmentOptions';
+import {getCoverageFilePath} from './paths';
 import {spawn, spawnSync} from 'child_process';
 import fs from 'fs';
 import os from 'os';
@@ -51,10 +52,14 @@ export function getHermesCompilerTarget(variant: HermesVariant): string {
   }
 }
 
-export function getBuckModesForPlatform(
-  enableRelease: boolean = false,
-): $ReadOnlyArray<string> {
-  let mode = enableRelease ? 'opt' : 'dev';
+export function getBuckModesForPlatform({
+  enableCoverage,
+  enableRelease,
+}: {
+  enableCoverage: boolean,
+  enableRelease: boolean,
+}): $ReadOnlyArray<string> {
+  let mode = enableCoverage ? 'code-coverage' : enableRelease ? 'opt' : 'dev';
 
   if (enableRelease) {
     if (EnvironmentOptions.enableASAN || EnvironmentOptions.enableTSAN) {
@@ -151,6 +156,7 @@ export function runCommand(
       encoding: 'utf8',
       env: {
         ...process.env,
+        LLVM_PROFILE_FILE: getCoverageFilePath(),
         PATH: `/usr/local/bin:/usr/bin:${process.env.PATH ?? ''}`,
       },
     },
@@ -191,6 +197,7 @@ export function runCommandSync(
     encoding: 'utf8',
     env: {
       ...process.env,
+      LLVM_PROFILE_FILE: getCoverageFilePath(),
       PATH: `/usr/local/bin:/usr/bin:${process.env.PATH ?? ''}`,
     },
   });