See this thread, it tells all
Basically the CXN can stream from Roon with artwork only by AirPlay where you are limited to 44/16
To get better you can use any number of devices but they all go to the digital inputs of the CXN , either USB or D1, which loses artwork.
The thread discusses the shortfalls of Linux and USB class 2, you can only run USB up to 24/96 , other D1 sources to 24/192
You effectively using the CXN as a Dac
Mine is the original version but I don’t think that has changed
One bit I am uncertain about is the Chromecast support on the V2, Roon maysee that as an end point , perhaps you try and let us knowc