Feature request: Color bucket and filling drawings

Dear Notewise dev team.

I've been using Notewise for 1.5 years and let me say this first. Thanks a million for your great, fabulous, beautiful and convenient app. I've never had such experience with any other apps. So thanks again for your hard work. I'm truly satisfied and believe the money I paid for the subscription is totally worth it. However, there is this feature that I saw in an app and I wanted to know if you are able to maybe work on it and add it to the app. It goes like this: I draw a closed shape for example a circle, a half of a circle, a square or just as I said a closed drawing with my hand. With that feature I can fill that closed drawing with my preferred color automatically. This makes filling the drawings more convenient than coloring it with hand. If I remember right, this feature is included in the Paint app in Windows. The icon is a paint bucket and it allows you to fille a closed area of the your drawing.

Thanks a lot in advance.