Your phone model, Xiaomi 13T, supports Dolby Atmos for its phone speakers. No audio jack, and whether or not Dolby Atmos support extends to external dongle-connected headphones or bluetooth-connected headphones, is unclear. How does this work in your experience?
Knowing Apple, and Dolby, trying to keep their licensed stuff under wraps and lock and key, I don't think Poweramp will be able to intercept whatever your phone and Apple Music are programmed to do in terms of DSP.