How can I draw in the canvas plugin?

I just want to move the mouse and start drawing anything. It's as simple as that, but I can't find how to do it and I want to do it in canvas. Does anyone have an example please? And if you can add it as an example to Construct 3, please do so. Many people will be very grateful.

Here you have it: fileport.io/26cnx5UhAPdP

Thanks friend, it seems easy but for people like me it is super complicated, this post will be useful to many. What would we do without people like you? Thanks again.