.otr support

Is your feature request related to a problem? Please describe

.srt and .vtt support. Otranscribe is a fully selfhosted and open source transcription service.

Describe the solution you'd like

Support for .otr file format

OTR file format

oTranscribe has its own file format (.otr), which is just a JSON file with the following parameters:

text: The raw HTML of the transcript
media: If available, the name of the last media used
media-source: If available, a link to the last media used
media-time: If available, the playtime of the last media used

The service also offers transcriptions as plain text or markdown

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

https://github.com/oTranscribe/oTranscribe https://otranscribe.com/

Transcriptions are even possible directly from their hosted instance