Have you tried build several shapes and then merge them together into one?
There is another trick you can do but let's see if this suggestion works.
Thanks for not deleting the post! It helped me.
All I you need to do is the following
1. Select "shape fill circle" icon to add a round fill to the mask layer like you did before.
2. Select "shape void circle" icon to add void to the middle of the mask fill you just added. It will blow a hole in your first fill. Then you are done.