Is there a way for me to have a field act as a drawing canvas?

I will probably create an example and post it over the weekend. I am not sure what steered you to that particular package but there are hundreds of libraries that allow you to draw on a canvas for every purpose from grabbing a signature to whiteboarding. The ability to convert a canvas to a dataurl is in a feature of the canvas element itself so you can do what I describe in any library that supports drawing on a canvas - and do it within QuickBase to boot.