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You can use a nested serializer to make this work.
class FSerializer(serializers.Serializer):
value = serializers.Field(source="f_value")
metric = serializers.Field(source="f_metric")
class MyModelSerializer(serializers.ModelSerializer):
somefield = serializers.Field()
f = FSerializer(source="*")
This should give you the nested output you are looking for. You can find more information on nesting serializers in the Django REST Framework documentation.
Source:stackexchange.com