If you can play it on your PC you can stream it to Roon as a My Live Radio station.
I just found a tool called Stream What You Hear (SWYH)
I’ve searched and seen it mentioned a few times around the forums but think it deserves a bit more love since it can solve a lot of “Can I play X on Roon” problems.
Pretty lightweight and easy to use. Free and Open Source. Requires a Windows PC. Max stream quality MP3 320kbps.
(I’ve posted some more notes for setting this up as a comment on another topic here; Soundcloud/mixcloud streaming)