How to extract key from schema to place at a different place in response?

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Hi,

I need to duplicate a nested value in a response and hike it up to the root of the response JSON, but I am completely lost as to how to accomplish this.

I would like test to return the target_value in the response json

Thank you for all your help!

**Current Schemas in question:**

```
class ProposalItemResponseSchema(BaseSchema):
test = fields.Method("get_test")

def get_test(self, data):
return self.context['test_mode']

class ProposalItemFullResponseSchema(ProposalItemResponseSchema):
package = fields.Nested(PackageResponseSchema)
screens = fields.Nested(ScreenFullResponseSchema, many=True)
end_date = fields.Date(default=None)
active_type = EnumField(TypeOfBuy)
combined_end_time = fields.DateTime(default=None)
combined_start_time = fields.DateTime(default=None)
provider_id = fields.Integer(default=None)

class Meta:
# Need this to be backward compatible with Marshmallow v2.x
# https://marshmallow.readthedocs.io/en/stable/upgrading.html#datetime-leaves-timezone-information-untouched-during-serialization
datetimeformat = "%Y-%m-%dT%H:%M:%S+00:00"

def get_attribute(self, obj, attr, default):
# Save the proposal item id in the context for retrieving the proper
# proposal_item_screen.contribution in the screen nested schema
if attr == "screens":
self.context["proposal_item_screens"] = {pis.screen_id: pis for pis in obj.proposal_item_screens}
self.context["proposal_item"] = obj
return getattr(obj, attr, default)

class ProposalFullResponseSchema(ProposalSchema):
id = fields.Integer()
calculated_start_date = fields.Str(default=None, data_key="start_date")
calculated_end_date = fields.Str(default=None) # Returned as a string from the model.
proposal_items = fields.Nested(ProposalItemFullResponseSchema, many=True)
categories = fields.Nested(CategoryResponseSchema, many=True)

class Meta:
# Need this to be backward compatible with Marshmallow v2.x
# https://marshmallow.readthedocs.io/en/stable/upgrading.html#datetime-leaves-timezone-information-untouched-during-serialization
datetimeformat = "%Y-%m-%dT%H:%M:%S+00:00"

def get_attribute(self, obj, attr, default):
# Save the proposal item id in the context for retrieving the proper
# proposal_item_screen.contribution in the screen nested schema
self.context["test_mode"] = obj
return getattr(obj, attr, default)
```

**Response JSON**

```
{
"proposal_items": [
{
"test": {
"target_value": 983,
"fluff 1": 983,
"fluff 2": 983
}
}
]
}
```

**Desired Response**

```
{
"proposal_items": [
{
"test": "target_value"
}
]
}
```

Start by reading ProposalItemResponseSchema, ProposalItemFullResponseSchema, and ProposalFullResponseSchema, then compare the current and desired response JSON. Determine whether the requested nested-value relocation is supported by the schema definitions and identify the relevant Marshmallow field or schema behavior; done means documenting or demonstrating a clear way to produce the desired response.

Written by the indexing model from the issue text.