Did you know Youtube allows you to search for subbed videos and get the transcript?
The method is still imperfect but can be helpful if you want to get a closer look at the spoken text, which then can be copied and translated.
The problem is that not all subtitles are in Chinese and not all subtitled content contains a transcript. You can try some random Chinese keywords like “为什么” and autosearch will offer you suggestions.
Add a comment below, if you get lucky or have any suggestions.