I haven’t tried it, but this article says you can use annotation tools while using zoom if you have it enable.
https://support.zoom.us/hc/en-us/art...bile_site=true
You could highlight and then erase or undo as you go.
If you used google products, you could paste the text into slides, then make a transparent yellow rectangle and use that as a highlighter strip. I could do it in docs, too, although in my mind it wouldn’t be as easy. If you can do it in slides or docs, you can do it in PowerPoint or word.