Blinking/Breathing effect for Touchbar Button

I have been looking all over for that, I saw a Youtube video in which the guy has BTT configured with a Button which was blinking/breathing. Any idea how to do that? to me, it looks like buttons are static and the only option is to 'use alternate value' - Can anyone put me in the right direction? (I just want my battery icon to blink when the battery is low)

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can you send the link to the vid pls? just out of curiosity

digging YouTube history...

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