From the last Update: JSON <-> Data Type 🔄, HOW!?

I was reading the announcement of the recent update with some excitement, as it sounds like that FlutterFlow now supports automatic mapping from JSON responsonses into custom data types. That's a huge for API integrations.

But how does this "new JSON to Data Type feature" work, where, how?

The documentation refers to a manually mapping for JSON responses to data fields, I am not sure if this is what I am looking for?