it works like joiplay. It called spark it the joiplay of iPhone. When you’ve paid cyan Patreon and gotten his game try adding the windows download into spark.
And unfortunately it doesn’t support RPGM but only works with renpy at the moment.
it looks like the beta is already full. You can by the other beta on App Store, I think it cost $7
https://apps.apple.com/us/app/spark-renpy-novels/id6474479684