ha-supervisor/supervisor/data/asound.tmpl

pcm.!default {
  type asym
  capture.pcm "mic"
  playback.pcm "speaker"
}
pcm.mic {
  type plug
  slave {
    pcm "hw:$input"
  }
}
pcm.speaker {
  type plug
  slave {
    pcm "hw:$output"
  }
}