Accept raw subtitle text in newSubtitleFile

Describe your suggested feature

Currently, newSubtitleFile only accepts subtitle files via URL. However, subtitles often come packaged inside ZIP files or other archives. After extraction, developers need to set up a local proxy or temporary server just to provide a URL for the subtitle content.

Proposed Enhancement:
Allow newSubtitleFile to accept raw subtitle text directly as a string parameter, in addition to the existing URL option.

Use Case:
When extracting subtitles from archives, developers could pass the text content directly instead of creating workarounds to serve it via URL.

This would significantly improve developer experience when working with archived or dynamically generated subtitle content.

Other details

No response

Acknowledgements

• My suggestion is NOT about adding a new provider
• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.

Start by locating the newSubtitleFile entry point and reading how it currently accepts and loads subtitle URLs. Trace the subtitle handling path to determine where raw text can be accepted alongside a URL, then inspect the existing tests or add coverage for both input forms. Done means archived subtitle text can be passed directly without a proxy while URL input continues to work.