Action "alfa" in element's conditions


would be nice to have an alfa(opacity) property in the list of properties that can be changed if a condition is true.

Is this possible to implement or to achieve with some workaround?

You can already do this! It’s kinda hidden, it’s on the “Color” property. I took a screenshot:

The 100 is a numerical way to manipulate the opacity, while the checkerboard vertical bar lets you use a slider to adjust it.