I made a bottomAppBar as shown in the above picture.
Here’s My code:

ClipRRect(
    borderRadius: const BorderRadius.only(
        topLeft: Radius.circular(35), topRight: Radius.circular(35)),
    child: BottomAppBar(
      elevation: 10,
      shadowColor: Colors.black,
      shape:
      const CircularNotchedRectangle(            
      ),
      notchMargin: 12,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
         //items of bottomAppBar
        ],
      ),
    ),
  ),

However, I want the smoother effect of notched part as shown in the picture below.
How can I achieve this?