How to populate a Chapel class object from a JSON?

In Python, I can create objects from JSON pretty easily. I can either populate classes or just create a generic object. I see that Chapel has a read method for JSON, but I'm not sure how to use it.

If I have:

class Fighter {
  var subclass:string;
  var level:int;
}

and a string:

s = "{'subclass':'Ninja', 'level':7}"

How do I get a Fighter object?
And are there methods like:

n = json.loads(s)
n['subclass']             # = 'ninja', but just as a field key

Or:

Hattori = Fighter.read(s);
Hattori['subclass']       # = 'ninja'

Thanks!