As a dedicated Android user, I believe this functionality is a missing "Pro" feature that would keep the OS competitive and user-centric.
@Google@Android
I am writing to suggest a high-priority feature enhancement for the Android OS: Native Per-App Audio Routing.
Currently, Android lacks a native way to split audio streams between different output devices.
For example, a user cannot easily stream music from Apple Music or Spotify to a Bluetooth speaker while simultaneously browsing Instagram or TikTok and having that audio play only through the phone's internal speakers.