Want to give it a try?
~/.godot/app_userdata/strive/mods
Create that folder, extract a mod in it, should show up in the game, hit apply and see what happens. I recommend running the game from a console so after applying you can see what errors might occur (note there are errors that pop up every time you exit the game which can be ignored, so maybe start and exit to see what those are for comparison). Then run again and see if the game/mod still works.
It works by copying around and modifying the game's own script files, which i think the game will be allowed to do within it's app folder, but I'm not sure anyone has tested it yet.