How can I control the mask point?

Hi everyone.
How can I control point in the circle by using the Expression???
Is it possible?

There's no direct and easy way to control individual mask path vertices with expressions, but it is possible.
Christopher Green has a script (Connect_Vertex_To_Point.jsx) on his website that attaches a vertex to a control point. You can use that script to figure out how to do something similar.
I'll try to put something more direct together myself.

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