Tvheadend

To stream IPTV, I use the following on my RPi with LE 7.0.2 in TVH 4.0.9:
pipe:///usr/bin/ffmpeg -loglevel fatal -i http:xyz.m3u8 -c copy -map 0 -f mpegts pipe:1

and when I test it in a command line of my RPi by removing pipe:// from the beginning, I see stream is comming in.

But, some links I need have a | in them and it breaks things:

pipe:///usr/bin/ffmpeg -loglevel fatal -i http:abc.m3u8|User-Agent="AppleCoreMedia -c copy -map 0 -f mpegts pipe:1

so this part kills things:

|User-Agent="AppleCoreMedia

I can change things to: |User-Agent="AppleCoreMedia" |User-Agent=AppleCoreMedia
'http:abc.m3u8|User-Agent="AppleCoreMedia'

and then the command is not broken but stil does not work. From playlist, the original command works perfectly in my Kodi as written in my original example. Without User-Agent it does not work.

Any help on how to make this work in my pipe command?