How to call a third Party Graphql endpoint from my Graphql apollo server

I have a graphql server/endpoint/schema generated by mongodb atlas that can not be converted to a subgraph to use Apollo Federation.

I would like to create my own Graphql server that would consume the mongodb atla graphql endpoint (as we can do by consuming a Rest API endpoint or database e.g @apollo/datasource-rest)

Do we have something equivalent for graphql that would ease the datasource management (@apollo/datasource-graphql) and consume a graphql endpoint from apollo-server?

What would be the best approach?
which library can i use? Any examples?

Thank you for your help