JSON dot notation with Optimize Response in HTTP Request tool

I enabled the Optimize Response switch in an HTTP request tool. I can select the top level fields, but not their children.
How do I select bookings here?

I tried guests[0].bookings but it returns an error.

Are you needing to retrieve a value in the code node?

The information I have is that the code node must return a list, and the list must contain object types, such as [{“key”, “value”}].

Maybe try set the field to be auto selected by the llm but then provide a description