Forms data not returned when querying Master Activity ID in multi-segment activities

Summary:
In Oracle Field Service, we are working on multi-segment activities.
With each segment, a form is submitted containing a custom property: "New Meter Reading".

When we query in Postman using the Master Activity ID, the response does not include the custom property ("New Meter Reading"). The field is only available if we query each child segment activity ID individually.

Questions:

1. Shouldn’t the Master Activity response also return the custom property values submitted on its segments?
2. Is there a way (configuration or mapping) to make these custom field values available at the Master level?
3. Or is querying each segment activity ID the only supported approach?