Sure. And then you also want to query subfields, you can extend your query parameter list with some specific scheme for that (e.g. `subfields=fieldX.subfieldX,f

Sure. And then you also want to query subfields, you can extend your query parameter list with some specific scheme for that (e.g. `subfields=fieldX.subfieldX,fieldY.subfieldY` - and then you can enhance it with filters, mutations, recursion, introspection, types, documentation, deprecation features... and then you have built your own version of graphQL. At some point, it is better to leave the custom solution field and go for graphQL before rebuilding it.