How do I build a cart-abandoner audience from VTEX cart events?

My VTEX store is now streaming cart events into Croct and I want to target the shoppers who keep abandoning carts with a little return-nudge experience.

I started poking at the CQL but I am not sure which conditions map to the cart signals. Here is teh half-formed thing I have so far:

user abandoned cartcart total > 0

That is clearly not right. What are the actual forms I should be using?