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Usually a DVD or whatever will have two different subtitle tracks. One for translating all the dialogue and another for what you are talking about. Tools like Handbrake have an option for “foreign audio scan” which will identify that track and mark it as “forced”.
If your video files don’t have that track I would search for one on the sub sites and mux it in using MKVTOOLNIX or something. If you do that, set the forced flag yourself and Jellyfin should play it automagically.
It's called Forced Subtitles by the way! you can also find a lot of subtitles online for free, and downloading subtitles is not piracy btw.
This is typically done through what are called “forced subtitles”. I’m not sure if you have any specific question like how to enable forced subtitles, or how to get forced subtitles. But hopefully if nothing else having the keyword helps.