I thought you wanted something other than AirPlay, i.e. a better SQ.
If that’s true, then you will need some sort of transport device, either RoonReady or running RoonBridge.
It looks like you’ll need a device that can input to the RCA or Optical inputs on the Yamaha.
Something like this -
https://allo.com/sparky-eu/digione-player.html
See this guide -
https://kb.roonlabs.com/Roon_User_Guide