DictField key validation

[snowman2]

https://stackoverflow.com/questions/75148782/django-rest-framework-serializers-dictfield-constraint-on-possible-keys

Something like serializers.DictField(key=serializers.ChoiceField(choices=[enum.value for enum in Enum])) would be great but that's obviously not available.

It would also be nice to run validators on the keys as well. Adding key as serializer Field would enable that in a more DRF way of doing things.