Roon has been Apple Silicon for years now. They’ve done that pretty quick after the M1 arrived.
Roon runs very well on my M1 MacBook Pro. However its 8 gb of RAM is really holding it back.
I reckon when it comes to Linux. It runs the Roon Server part, but no support for the interface. Likely not enough Linux users to warrant development of it.
Let alone the multitude of different Linux distributions and desktops which are available. And not even counting the many differences between x86/64 and arm.
We do have a guy here on the Room Community who develops the Community Remote for Linux, first native Linux GUI (v0.2.0) It works quite well here on Linux Mint.