new overlay Material -> no Parameters to change ?

I was not able to find a solution how to change a Parameter of a Material Instance, when I use it as the new Material Overlay (5.1)
is there any new way ? or is it not yet possible.

the Scalar Parameter references to the Mesh Material, but not to the Material Overlay.

any help appreciated

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Did you found it?

What did for now is creating 5 variations of material and swap them based on some logic, but there is no transition.