Can't see any existing solution for it - surprised in some ways. You could use a stand-alone subtitle player but syncing it and keeping it synced would be a bit of a pain.
Short of setting up some kind of capture platform that cropped and zoomed the area of the screen where subtitles are and streamed that bit to the phone I can't really think of any other way of doing it.
Short of setting up some kind of capture platform that cropped and zoomed the area of the screen where subtitles are and streamed that bit to the phone I can't really think of any other way of doing it.