The stroke plugin is what you’re looking for. The stroke plugin uses a mask and it doesn’t have to be a close mask. after you draw out your mask, you can animate it. you can use one mask or you can use many mask, if you use many mask, you can make stroke reveal sequentially ( as in the first mask you make it will reveal, then it will reveal the second mask you make) A very good tool and perfect for your need. I hope you understand what I mean, if not I can go further into detail how to use it