How to handle REST API error (400) response payload in VBCS ?

I have a REST API that returns two different types of responses:

1. Success scenario (HTTP 200):
   Returns a JSON payload with the expected data.
2. Failed scenario (HTTP 400 – Bad Request):
   Returns a different JSON payload that contains error information (example: error code, message, details).

In VBCS, while creating the Service Connection, I provided the success response JSON as the sample response schema. Because of this, the response structure generated in VBCS reflects only the success payload fields.

Problem:
When the API returns a 400 error, VBCS receives the response but I am unable to access or map the error-payload fields inside the Action Chain. The error JSON doesn’t match the success schema, so I can’t bind or display the error message to the user.