Just a couple of weeks ago, I discovered that the ARRAY (aka List) in JSON was a later addition to JSON (5. Arrays, Objects, Functions and JSON - Mixu's Node book). Using Properties with names like place1,place2, place3, etc. feels a bit peculiar for me, who learned JSON through Thunkable.
To loop through properties which are treated like a list, you can use the following loop structure:
https://x.thunkable.com/copy/fe54663300fc58722be1a778daa55fe2
Notice the loop is through the PROPERTIES of the object, not the object itself (like when the object is an array (as in tatiang’s example). Then if you want to get the object, you need to use the Get Object Property Block.
It feels a bit pecular, but it has some advantages. One big advantage is that you can reference objects in a list by NAME, rather than having to loop through the list to find it. One big disadvantage is that the order is dependent on the object name.