Mutation with entities

Hi all,

I have apollo federation v2 setup.
I have a use case where I need to add a mutation in one of the subgraph( say Subgraph 2)
The data I need to update on server is being fetched in another subgraph ( Subgraph 1).

I have identified a key with which I can relate the two subgraphs and thats what my client is sending during mutation.
I need to fetch data from Subgraph 1 based on this ID and then handle mutation in Subgraph2

I have identified that I can implement this based on common data sources which can be referred in both Subgraph1 and 2.

Is there a way I could query into Subgraph 1 from Subgraph2 and therefore be able to fetch the data from Subgraph1?

Has anyone solved such a use case, please share your views?