I will, once again, bring your attention to hashql, which is so pleasant to use. It's so minimal that it is almost more a pattern than a library. Try it out as an alternative to graphql if you are mainly querying a SQL database anyhow (although it can be easily configured to request data from other types of sources.) I don't think it can currently combine results from multiple data sources, but I think it should be within the realm of possible things
https://github.com/porsager/HashQL