guess is depends if only if it HAS subtitles included in the broadcast! im getting a streamer, but not from 'digital channels' but from actual film files and download subtitles to match.......
OH
if you doing it 'my way'
what you need to do is, do a copy paste from film's film name , make is exactly the same, for the .srt or .sub files, that way the streamers will recongise it and play the subtitles files too while playing the film.......
thats the only thing i can say, i don't exactly what you mean because I will never use netflix, you tubes channels...thats just not me...