Using your link above to GitHub - the idea would be to save the link as a file - so right click would save it as playlist.m3u8.
Shayde is talking about using downloader to do this from his post Aug 2023, then use Tivimate to use downloaded playlist file.
Your advice to RickPsz is correct - just enter the url, as this is free - no username / password
I guess RickPsz read this old post from Aug 2023