If you are trying to use specific attributes from a given entity for a parameter in scss file, I don’t have any idea how to do it. So far as I know, it’s not possible.
Did you consider the ‘dynamic classes’ property of a widget?
Feel free to add a comment to correct me.
You can make use of Custom Visibility by creating different objects and Showing them on base of what user wants by setting their visibility conditions,
Hope it helps!