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It's definitely not something you can do within Plex itself. Though while I've never tried anything like that, I've heard UnicornTranscoder mentioned before, which in theory does exactly what you want, though it doesn't look like it's been updated in a while.
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MediaInfoLib
Convenient unified display of the most relevant technical and tag data for video and audio files.
If you use something like MediaInfo to inspect those files, my guess is that those subtitles are embedded into the files themselves.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.