#EXTVLCOPT is a VLC specific

For modern IPTV players (most in Android TV native apps) you can pipe the additional headers

I pass Referer header in my playlist in Tivimate using
https://site.com/stream.m3u8|Referer=https://some-referrer.com

Or User agent
https://site.com/stream.m3u8|User-Agent=SomeAgent