Closed Captions on "Movies & Shows (On Plex)" and "Live TV (On Plex)"

I’m just getting started with the “Movies & Shows (On Plex)” and “Live TV (On Plex)” and I’m really enjoying the varying selection that’s available, but I feel like the inability to turn on Closed Captions is hampering my experience. I’d like to open up this FR to suggest a way to have them added.
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(The above image is from Plex Web, but I watch on Roku and Android devices)

If you see “none”, that means there are no subtitles available. If a subtitle is available for the content, it will be there.

That’s not entirely true. Plex and a bunch of DVD players and Blu-ray players can’t properly display line 21 Closed Captions. Windows Media Player in Windows 7 could decode line 21 captions also VLC can but poorly. We are talking about black box captions here NOT SUBTITLES