Hi.
I just bought this today and it does not work with Godot 4 and since it seems to be abandoned I made a small utility to make it a little less painful to use when exporting for Godot from GridlessDB.
You can find it here:
https://github.com/Rajdarn/GridlessRefactor/tree/main
I hope it helps and that it does not destroy anything! Use at your own risk!