std.json / nested key/value access?

[Robert M. Münch via Digitalmars-d-learn]

I have:

 JSONValue j = parseJSON(json_string).object;
 writeln(j);                                                    // works
 writeln(j["a"]);                                     // works
 writeln(j["a"].object["b"]);       // bombs

Runtime error: std.json.JSONException@std/json.d(276): JSONValue is not 
an object

How can I access a nested JSON key/value using something that comes 
close to a path notation?

--
Robert M. Münch
http://www.saphirion.com
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