customData property
Custom device attributes stored in Home Graph and provided to your smart home Action in each QUERY and EXECUTE intent.
Data in this object has a few constraints: No sensitive information, including but not limited to Personally Identifiable Information.
The values for Object must be JSON objects. It can consist of num,
String, bool and null as well as Map and List values.
Implementation
core.Map<core.String, core.Object?>? customData;