supplementalTopLevelData property
This map is merged at the same level as the topLevelKey in the payload. For example,
given supplementalTopLevelData: {'other_key': true}, the payload would become
{"topLevelKey": ..., "other_key": true}. It is strongly recommended to avoid using
this property. Your data should be managed at the model level, not the query level.
Implementation
final Map<String, dynamic>? supplementalTopLevelData;