Use Google Assistant with AV Receiver Pioneer

Hello everybody!
See, I have a Pioneer vsx-831 Receiver with wifi and bluetooth and Chromecast built in.

My question: How can I use the Google Assistant voice commands to:
Open and run Deezer or Tidal in the "Pioneer Remote App"?
Since I can only open the app saying "Ok Google, open Pioneer", but I can not make it choose then "NET" and then "Dezeer" and play it.

I hope you can help me. Thanks!