adding subtitles to Netflix

How to add subtitles to Netflix in a way, that LR is going to recognize it as “English sub” for example.
Let’s say I’m watching anime, and it’s only has japanese subtitles, but I want to add English subtitles from a “Open subtitles”, as I download it, and add it to the series, LR doesn’t sees it as a English subtitle, I even tried to rename the file to “English” but it didn’t worked out.
My point is to watch anime with both Japanese and English subtitles but I don’t know how to do it…
Sorry for my English, if I made mistakes.

Thanks for your help :slight_smile: