As far as I understand neither 4K nor HDR are available on Sunrise TV App, neither for Samsung Tizen OS, nor for Android or Android/Google TV.
Now, the question, is my understanding correct and, if so, when it is planned?
I’m only asking this as I’ve recently discovered that most of the channels finally switched to FullHD (1080p/50fps), as compared to last year, when the same channels were in HD (720p/50fps)