Is your feature request related to a problem? Please describe.
It would be a fantastic feature (that few frameworks does well) to have composite entity support, in order to catch entities that belongs together - for example catching:

[{ "fruit": "banana", "quantity": 2}, { "fruit": "apple", "quantity": 1}]

from the utterance I want two bananas and one apple.

Describe the solution you'd like
That the NER manager supports composite entities, which are composed of sub-entities and has a pattern of how the sub-entities belong together in an utterance - for example "@entity1 @Entity2". The composite entities should in turn be able to include composite entities, and list entities should be able to support compositie entities.

Describe alternatives you've considered
I considered if RegEx entities could be used to hack a solution to this, but it probably is a bad idea.

Additional context
N/A