Partial fetch of JSON object / caching / Types

[rfsch]

Hi
I am facing the problem that I need to update only some values in a huge JSON object returned by a REST.
I fetch the JSON object in one request. I get some values by another typed request. I change these values. I update the JSON object with the values. I post the JSON to the REST endpoint.
Is there some support in Apollo server for such a case where the client needs only some values of a JSON object and then needs to post them in a modified JSON object to the REST endpoint ? I would like to request the JSON and then be able to query it woth graphql

Any help would be greatly appreciated!
Thanks