let's say that you have a Kotlin android app, Swift iOS app, a Dart Flutter app and cloud functions written in typescript.
there should be a way to re-use shared queries across the whole stack.
having a query language like SQL and pass those redundant queries across all apps that would be really efficient and could save developers a lot of time and it could produce less bugs.

I'm not suggesting SQL, I'm suggesting to have a query language that's all.