In Fusion, you can create a BrightnessContrast node. Inside the node, at the Inspector, the slider that controls Opacity is not named, but has the words LOW and HIGH. It controls 0.1 to 1.0 (or more). You can stipulate which of R, G, B, or A (all) are controlled. By pressing A (for All), I find that sliding the controller between 0 and 1 controls the opacity.
To animate, this slider can be keyframed.
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