Increase/Decrease hue scene brightness with pico remote buttons in an automation

I’m trying to increase/decrease a Hue scene by a number or percentage when a button is pressed. The fact I’m using a Lutron Pico isn’t really relevant. I have the on, off, and favorite buttons currently calling a Hue scene and that works great. I cannot figure out how to have a Hue scene increase/decrease based off the current scene brightness. To get around this, I’m currently calling increase/decrease on each Hue device independently in the automation which isn’t good. How do I get the current scene brightness so that I can just set the new value based on that?

Ultimately I want to update the value of whatever is the current scene and not change to a scene.