Access a supabase function through a custom action.

Hello:

I have a function in supabase that returns a series of records based on two input parameters: Name to search for and the uuid of the logged in user.

If I want to do it with API calls, it works great but... Flutterflow does not allow more than 2 API endpoints in both the free plan and the standard plan.

I have done the following custom action to access the supabase function and collect the results but... when saving it it always gives me the same message "Unable to process return parameter".

1.- Does anyone know what I'm doing wrong?
2.- Does anyone know another method other than an api call to call a supabase function and collect the results?

I would appreciate examples.
Thank you so much.