I use Zoom to teach online. I love the annotation capability, but there really aren't that many colors that work well. They are just hard on the eyes, or hard to see. Could you put some effort into refining the color options, OR allow us to add custom colors?
Also, I love sharing a "Whiteboard," but it sure would be nice to be able to pick the color of the whiteboard, because white isn't really my preference, and there isn't enough contrast available (other than glaring red).