Not Getting Subform Data from API 2.1

Not Getting Subform Data from API 2.1

I have a CRM function that needs to pull subform data from a creator form. I am using the API v2.1 and tried updating the field_config to "all", and "detail_view" (which has the subform in the report I'm pulling from). None of the API responses are returning the subform data. How to I get subform data from the API.