I also ended up with the S8 (not MaxV), which you can use the MI app for, I am very certain that there is no way to create a community app for the Roborock app and new devices. Sorry. I would suggest putting in a request with Athom to build an offical app, they have had some luck with aqara etc.
An offical Roborock app would be a good addition. @Doekse
