PowerUp: Count Cards in a List

I'm looking for a PowerUp that simply counts the cards on a list, and puts that number on top of the list, near its title.

I used something similar years ago, but for the life of me I can no longer find it.

If you filter the cards this is already done by default, but I'd like something that appears even if you're not filtering.

I found a couple of PowerUps that show the card progressive number on every card, but that's totally not what I'm looking for, even if the concept is similar: I need that number to be at the top, on/near the list title.

Is there something like this somewhere?

Thanks!