how to create a BottomNavigationBar with a curved notch in flutter

Question

I'm trying to create a curved notch in my bottomNavBar like the following image: Desired Shape

I've tried to use the CircularNotchedRectangle shape but i didn't get the same shape, i tried to use a custom paint with quadraticBezier but this is the best i've got: Custom Paint I don't have a good knowledge in customPainter or canvas so I'd appreciate if you send a good resource to learn from or give a hint on what i should try to create the shape, if there's a package to solve this issue i'd be really grateful if you share it. i searched for packages but didn't find any.