Hello zazozaliad :)
This weekend I'm adding a bunch of files in the exterior-pack and dungeon-pack regarding the Godot engine (within \godot_autotiles\ folder) : this might helps you but it's not quite a SRPG tileset of course. Can you send my 1 or 2 samples at pixelart.asset [ a t ] gmail dot com so I can export my assets in their format as well in the future ? Thanks !