Javascript add an object into object array

Question

Example -

var users = {

};

var conn = "ajey";

var ajey = {
  name: 'ajey',
  age: 25
}

users.conn = ajey;

This returns

[object Object] {
  conn: [object Object] {
    age: 25,
    name: "ajey"
  }
}

As you notice the object key is "conn" but how do I make it substitute the value of conn which is "ajey" ??

JS bin here

NOTE - I am not trying to access the object key. I am trying to set the object key with the value of a variable