T+A only supports those rates via their Windows driver. I hope they’ll get the Linux Native DSD stuff (needed for ROCK) sorted out someday…but it isn’t there yet yet.
The best bet for getting that hooked up to a ROCK-based system is to run Roon Bridge on a Windows machine that’s connected to the DAC. This is what I do with the DAC-8 DSD that I keep near my desk.
The Windows machine that you use for this does not need to be expensive or fast. Pretty much anything will do, so long as it runs Windows and can support T+A’s ASIO driver.