Help! (Custom shaped buttons)

So I’ve been trying to create a sort of build menu in my current project and instead of having a bunch of squares or rectangles for the player to pick a building part, I decided to have different shapes around a circle. Here comes my problem:
Unreal engine (at least I haven’t found) has no way of having different shapes of buttons and so I have come to the forum for help. Any help is appreciated,
thanks in advance.