The pertinent iFi driver is accepted, but my attempts at including the DAC (it does not appear in the list) fail. I do, however get audio with crackles and pops similar to vinyl, only a bit more dynamic.
(Smoke me a kipper, I'll be back for breakfast!)
A DAC on its own can only be certified as Roon Tested.
Roon Ready status is for units with an Ethernet connection.