I cannot figure out what the correct syntax should be for the path expression in the Query JSON action.
This is my sample data:

When I parse the userCreated it returns nicely John into my variable:

But this is the one I actually need: The id of the first element of mediaItems. So I use mediaItems/(0)/id:

But this returns an error:

Questions:
- What is the right syntax?
- Where is this explained/described?

