I found some project
https://github.com/ebridges/rdbms-to-graphql for releational databases, so I am looking for some Graph server engine analyzer which generates ALL API in GraphQL form to access anything.
Of course in graph on top of query language we have complex algorithms which might be simply not supported in the beginning, but stuff like that. I think personally that we model data and load them via pipelines to graph engine, so its quite "wasted time" to model the access layer as soon as it is already modeled in graph itself :-)