If it’s a MKV, it’ll probably have them.in the file. You just need to use Handbrake and select the correct track to burn.into the file if you convert to a MP4.
Most that I download automatically have a subtitle when you finish the download. You have to play the file (I use VLC) and then I click on Subtitle and find out if it’s forced otlr regular subtitle. Then use Handbrake and burn in the forced (or regular subtitle, depending on what you want) and then add to my server. I do this so if Plex goes away then I won’t have to worry about it having built in subtitle support.
So you’re okay with it being fine for a White House administration telling tech companies what they can and can’t allow? If so, then just wait until.the next Republican gets into the White House. You may not like this because it’s against Bidens White House, but this ruling will prevent Trump from doing it as well…if he somehow got back into office…which won’t happen, but still. It’s a precedent.