Intent as optional field in nlu.json

Hey guys, I’m trying to create an nlu.json file without define the “intent” field, only entities.

The documentation https://rasa.com/docs/nlu/dataformat/ says that intent is an optional field:

The intent is the intent that should be associated with the text [optional]

so it should work - however , i’ve tried that in multiple ways (with empty field, none, null) but none of them work.

Any ideas how to solve that ? Many thanks