[Feature Request]: Support YouTube's custom subtitle format (json3)

**Is your feature request related to a usage problem (not a bug)? Please describe.**
Some videos have fancy / rich / coloured / special subtitles (I don't really know what they are called, sorry) and they don't get rendered properly (at all) like normal subtitles do

**Describe the solution you'd like to see implemented**
A way to display these fancy subtitles; if its too much time to have the full colour and positional data, falling back and drawing them as normal subtitles is fine?

**Describe alternatives you've considered**
Not using subtitles for that video, just displaying them as plaintext, generic subtitles as like the majority of videos

**Screenshots**
Here is an example video: https://youtu.be/L-MVk5I6wjo (Seems to be for all languages)

(expected output -- please note the video below has audio)

https://github.com/user-attachments/assets/35c99369-1242-4d23-bfa0-0e0cef51e39b

No source files, tests, or entry points are named in the issue. Reproduce the example YouTube video and compare its json3 subtitles with the current rendering; done means the subtitles display, with full styling when feasible or readable generic subtitles as a fallback.

Written by the indexing model from the issue text.