[Haskell-cafe] Loading JSON into a set of nested index-able structures

Hello All, I've used Aeson to load a JSON object with nested lists into a set of data structures, but what I really need is to load it into a set of data structures that are index-able such as a HashMap. I've had success loading the JSON into a structure with the lowest level being a HashMap using !Object, but I'm having difficulty in figuring out how to nest the HashMaps. Any hints or direction would be appreciated. Thanks, Carl