This is my REST call.
I am able to retrieve the data as a list.
I get the above screen when I try to add data to my reference selector.
This is my domain model. The NPE Employees is the entity where the data from API is being retrieved into.
Use a reference selector and a microflow as the source.
Retrieve the data via the rest call, associate the records to the object showing the reference selector.
The data retrieved could be set in an NPE entity and then on change create the persitent record and set the association.
Could be one approach.