I don't know of a plugin for Linux such as the one you describe but, especially on Linux, I'm not clear why you would need it anyway. If you need/want to record from an internet radio station, just switch REAPER's audio system input from ALSA to Pulse Audio. Then, anything playing in either your broswer or media player will be sent to REAPER's inputs and you can record it on any correctly set and armed track.
P.S. Remember to disable any system sounds first, of course, so you don't inadvertently record any of those as well!
Last edited by Xasman; 07-27-2021 at 01:29 AM.
Reason: Added a PostScript.
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