Add schema definition for implementation of interface

If the response returns an interface, how can I mark classes implementing this interface as schema's (so the consumer can read possible outcome)
I've tried adding an example to the OpenApiResponseWithBody and this shows the right possibilities at 'example value' but not 'schema'

Start by inspecting OpenApiResponseWithBody and how an interface response is converted into an OpenAPI schema. Compare the generated schema with the example value behavior described in the issue, then determine how implementing classes should appear as possible outcomes. Done means consumers can see those implementations in the schema, not only in the example.

Written by the indexing model from the issue text.