There is not yet and we do plan to add them but I do believe there is some fundimental issues with the complex queries within GraphQL at the moment. We have a database layer refresh set for this quarter ( https://portal.productboard.com/strapi/1-roadmap/c/73-database-layer-v4 ) that is also planning to implement some critical changes to how we handle GQL vs REST and our intent is to make their usage much easier.
I’ll try and do some testing this coming week to see if I can provide some useful examples for you, but for the moment my suggestion is using REST instead.