You could do something like this
EXCEPT…
Thunkable expected firebase lists to start with a 0 index. It looks like your lists start with 1. If the list index does not start with zero, Thunkable will crash. This is a REALLY crummy thing about Thunkable lists. Thunkable decided to use lists starting with 1. BUT thunkable is a graphic wrapper around Javascript, for which lists start with 0. So when comparing Firebase lists (zero based) with Thunkable Lists (base 1) you need to adjust. It is a awful pain, but it can be done.