Is Having Vertices for GUI Possible? Or is having a Polygon GUI possible?

Actually I'm try to make an ability hexagon GUI,
and i want to tween it to different shape when something happened.

I searched for a long time, and still can't find about this or making polygons GUI.
Also thought about making polygons by models and using ViewportFrame , but that will be impossible to tween shapes.

Also found a post about Splitting GUI into Geometric Shapes,
but that is not best ways for this.

So i'm try to Use Vertices to make polygons, but is there any functions about GUI Vertices?
Thanks for everyone who answered.