Passing $.geJSON object to another ember controller

So i'm struggling getting this to work. Maybe my aproatch is not good. I'm quite noob at using a Frontend framework like ember.js.

So, i've got a $.getJSON request obtaining a JSON data from a local file. The problem is that I need to pass this data, not to the template but to another object inside one ember controller.

I'm trying to use ember-cli-charts to I need to return the object in the last lines of the propierty.

  diffData: Ember.computed('model', function(){

    let url = "log_hr24_diff.json";
    let diff_data = Ember.$.getJSON(url);         

    return {
      labels: ['Difficulty', 'Date'],
      datasets: [
      {
        label: "Difficulty",
        data: diff_data
        },
        {
        label: "Date",
        data: date_data
        }
      ]
    }
  })

So that is not working. Either do this:

let diff_data = Ember.$.getJSON(url).then(function(data){
       return Ember.Object.create(data);
    });

So how do I get the JSON object from the diff_data JSON response to pass it to the return object?

Tried and search it a lot, but couldn't find an answer.

Thanks in advance!