Allowing for GraphQL support to use with external collection, as suggested in https://adalo.canny.io/feature-requests/p/graphql-support-for-external-collections would be the nonplusultra.

But I think something that is much easier to attend for now is support for GraphQL styled API requests. And of course it is already possible to send GraphQL requests. It's just not fun. So all that needs to be done in my view, is to provide a special UI.