class ParentModelSerializer(WritableNestedModelSerializer):
    # Reverse OneToOne relation with NestedObject
    nested = NestedModelSerializer(many=False, read_only=False)

    class Meta:
        model = ParentModel
        fields = '__all__'

class NestedModelSerializer(serializers.ModelSerializer):
    class Meta:
        model = NestedModel
        fields = '__all__'

{
  "notes": "blah blah blah",
  "data": 1,
  "info": 16,
  "more_data": 0,
  "nested_model_data": {
    "array_1": [
      ...
      ...
    ],
    "array_2": [
      ...
      ...
    ],
    "array_3": [
      ...
      ...
    ],
    "array_4": [
      ...
      ...
    ],
    "array_5": [
      ...
      ...
    ]
  }
}