Question: Possible as Subgraph?

Hi everybody,

I was wondering if this package allows the use of the graphql api in a subgraph (eg. https://www.apollographql.com/docs/federation/subgraph-spec/)

Therefore i think it would be required to reciev the sdl content via query:

```gql
query {
_service {
sdl
}
}
````

I can't find any information about that in this repository. Sry if this isn't the right approach to raise a question.