This app was mentioned in 3 comments, with an average of 1.33 upvotes
https://play.google.com/store/apps/details?id=com.blank.bm15&hl=en is a native Android app heavily inspired by Basketball GM. But even with all that work, the small screen is still a challenge. Maybe it's better on a tablet.
Chrome on iOS is just a thin wrapper around Safari, because that's all Apple will allow.
Mobile apps... it's technically possible, but it would be a lot of work and I'm not convinced sports sim games are that much fun on small screens. Here's an android basketball sim that was inspired by Basketball GM and has some similarity: https://play.google.com/store/apps/details?id=com.blank.bm15&hl=en
We have the old game released, basket manager 15 (free) in google play.
https://play.google.com/store/apps/details?id=com.blank.bm15