My bad, you are correct. For some reason I misread.
There is google-drive-ocamlfuse. Personally, even though the article recommends rclone, I would have started with ocamlfuse; something about the whole interaction with rclone seems flaky-sounding to me (the fact that it's not just fuse commands, but this whole other tool you have to interact with for doing stuff like 'ls' just seems weird). But like I say I have no real experience to be sharing; this is just me searching + sending to you.