Joiplay's renpy plugin is for up to renpy verion 8.1.1 iirc for now.
This release use renpy 8.2 for what I see in it's files, so we have no way to play with joiplay for now, fellow joiplay enjoyer!
For what I read 8.2 had a lot of changes & improvements so I doubt if new renpy plugin will out anytime soon.
If device's bit old you can still install android version and write Android/data/ dir without root as long as it's not installed in 'Work profile / Secret Folder / Island' or whatever it is.
But ultimately you'll want to have rooted alt phone/tablet to easier save file transfer/backup.