Enter in your coordinates and it will provide the corners of the chunk. (The blocks mentioned are inside the chunk). Works on Minecraft Bedrock Edition.
#Example This is an example of the terminal:
Input X:10 Input Z:10
Chunk Corners: (15, 0, 15) (15, 0, 0) (0, 0, 0) (0, 0, 15)
This means that coordinates in Chunk Corners are part of the chunk, but are the outmost blocks in the chunk you are in.