@Jon Kears Thank you for posting this. My JSON is not an Array (list) and I need to pull out values by a key at the time, so the key is not static but I to pull back item specific data by the item id. I'm basically struggling on the syntax to reference the value by key.

${m.someheaderfield}

is the syntax we have for things not in an array

In your case you know the key is "someheaderfield" right? In my case I want to use the item internal id which at the point I'm looking to use it would be the item.item value so something like ${m[item.item]} but no matter what I do it doesn't like it 😞