Hi, Try piping to FFmpeg each radio stream, create a network called radio and individually add the muxes for each radio station enter this into the mux Url,
pipe:///usr/bin/ffmpeg -loglevel fatal -i <https://put your stream url here> -vn -acodec libmp3lame -f mpegts -mpegts_service_type digital_radio pipe:1
I only have 20 stations if you have a large m3u you'll want to use a script to add the lines above to you m3u.
regards
Ryan