Schema Stitching Spring boot Implementation

I have an architectural based question, Suppose I have 2 spring boot microservices, All of them are exposing a graphql api
the urls will be http://domain/ms1/graphql, http://domain/ms2/graphql. In this case the front end will have to call 2 separate apis, however the purpose of the graphql itself is to have a single monolith api I believe, and also if I am using angular with apollo client then configuring 2 urls will have some other issues like caching. So does anyone has done schema stitching using java.? Federation could be an over kill for me at this point of time since my services are very small. I am looking for a small java spring based schema stitching service,
Any help .?
Thanks.