[Sloved] Cloth Modifier question about initial Pin vertices position

Good night to all.
I’ve a Cloth configured with pin’s connected to a hook. If i Scale the the hook during ALT+A the Pinned vertices behave as expected.
My question is:
Is it possible to change the Initial position of the Mesh Pins, with the Cloth Modifier influencing it before it starts running?
Kind of a parametric thing. Like start fully open, or start 50% open, but behave as a Cloth right form the beginning.
Thank you!

Here’s the Blend file.

Thank you but with Shape Keys I could achieve it!