although i don't know how to use it to get subtitles
IronicMan
Open DevTools in Browser (F12), click on Network and filter: srt
Now play (or reload) your episode select your subs in player, so you should see a srt at the left.
Open the srt with rightclick in new tab and you have srt in json Format
Easier with yt-dlp - example:
[code]yt-dlp --write-subs --skip-download --sub-langs English "https://tubitv.com/movies/100025373/wynonna-earp-vengeance"[/code]