Age of Empires had this powerful AGE (Advanced Genie Editor) tool to let players mod the game data with ease. You could see all the game's databases through this tool and play with them to make your own mods in a pretty straightforward way, which I suppose was also used by the devs themselves to author their data.
I was wondering how can I implement a similar editing interface for my game database?
Are there tricks like this that Godot, Unity and Unreal users use to author their data? I feel like I missed something because no popular engine seem to support what I'm looking for out of the box.
If I can't do it in-engine, how should I go to make such a tool myself?