I was actually curious on how to add a style to this specific plugin this forum thread is about, based on HTML+CSS, but ok.
But in regards to your suggestion If I were to create video sources, I guess I'd have to beforehand create one for each person/name right? And set them as separate sources and I guess, bind hotkeys to toggle them, is that what you mean?
Btw, videos can be rendered in the webm-format with a transparent background, so no need for chroma keying.
I've never researched modifying the styles. Hmmm, that would be a killer tutorial. LOL, it seems like every time I talk with someone, a new video tutorial reveals itself. A friend of mine said to me, "Dude, are you scared that you'll run out of tutorial ideas" I replied NO.
Yes, if you produce video LTs where the text is part of the video, you will have to make two for each person, BUT There is a way to combine the power of a video and a text source. It takes two plugins to make it happen, and it's involved, but you will learn epic stuff with OBS. Here's the tutorial
https://youtu.be/JzCMBWWpNxg. The gist of the video uses the Advanced Scene to stop a lower third video, then the Move transition reveals the text source, then time passes, and the text goes away, and the lower third video is restarted, and the LT vanishes. You'll love the tutorial. It's killer.
FYI: VP9 is the best, but there is a tiny bit more CPU/GPU usage to run those videos. If you use an uncompressed AVI, there is virtually zero decode CPU/GPU usage. It's incredible. Best wishes homie.