1. Google Pixel 4a
2. Stock (build.prop from /system and /system/vendor is in attach).
3. Qualcomm SDM730 Snapdragon 730G.
PCM, Playback: Up to 384kHz/32bit
4. Audio Outputs Detection Log
5. /system/vendor/etc/audio_io_policy.conf is in attach. If you need more, I'll provide.
P.S. Flinger info is in attach.
build.prop vendor_build.prop audio_io_policy.conf