Add viewport addon value to globals object

[Asfalot]

Is your feature request related to a problem? Please describe.

I work with a system where mobile/desktop views relate to a window config. I'm using your viewport addon and it works perfectly. The issue here is I can't get the value of the currently selected viewport and change config inside the decorators like it can be done with other globals and respectively can't change window config and rerender story.

Describe the solution you'd like

It would be great if the currently selected viewport value could be reached with the decorators in globals object (for instance backgrounds selection).

Describe alternatives you've considered

I have tried to implement my own viewport selection but it is not as convenient and takes a lot of effort to make it work.

Are you able to assist to bring the feature to reality?

yes, I can

Additional context

No response