According to the documentation here …
search_term can be used on dropdowns to automatically add the parameter on !http requests.
I’ve tested it multiple times with various configurations (even with the provided example) and the search_term parameter is never sent to my API. Are you sure this is working?
Just to provide some context: My use case is to provide some sort of validation to a text field. i.e: a field that cannot use unicode characters, my API endpoint automatically normalizes the searched value into a proper one and returns an array of valid options that can be selected.
When comparing this to other self-service app platforms like Make or Zapier, the form_fields section seems very limiting.