Webservice Function provides data no output to HTTP Request

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I am using a webservice function to provide more data on a cohort when created to the http request step but I have tried to add the data from the webservice function with no data showing up to the webhook, all I see is the filtercode for the data which I have set up as {data} in the body.

here is the json file:
{"name":"Corhort Created","description":"{"text":"","format":"1"}","event":"\core\event\cohort_created","debug":"1","steps":{"58":{"id":"58","name":"Get Cohort Info","description":"Get Cohort Info","type":"actions","stepclass":"\tool_trigger\steps\actions\webservice_action_step","data":"{"functionname":"core_cohort_get_cohorts","username":"","params":"{\r\n \"cohortids\": [{objectid}]\r\n}","stepdesc":"Webservice Function","typedesc":"Action"}","steporder":"0"},"59":{"id":"59","name":"Send to N8N","description":"Send to N8N","type":"actions","stepclass":"\tool_trigger\steps\actions\http_post_action_step","data":"{"url":"https:\/\/n8nurl\/webhook-test\/cohort-created","httpmethod":"POST","httpheaders":"Content-Type: application\/json\r\nAccept: application\/json","httpparams":"cohortid={objectid}&cohortdata{data}","jsonencode":"1","expectedresponse":"200","stepdesc":"HTTP request","typedesc":"Action"}","steporder":"1"}},"moodleversion":"2025041402","pluginversion":"2024111900"}

I would like to use your filtering ability but I never can get that to work.