Draw When sending pictures in Chat

Hi guys, i hope you’re doing great, Today i come with a question a little bit weird for some people but i think that there will be some people that will be able to understand me.

I’m trying to create a live chat within my application. The thing is, i want to create a canvas where you can draw something in a picture that you want to send, the same way Whatsapp does it or the same way the Snipping tool does it in Windows.

So if the user want to send me a picture while drawing in a part on the picture, he will be able to do it within the same chat. Without using another tool for it.

I put this image as an example so you can understand me better. (sorry if my english is bad tho.)