https://stackoverflow.com/questions/44185507/ember-helper-that-returns-the-resolved-value-of-a-promise

controllers.application.js

import Ember from 'ember';
import DS from 'ember-data';
export default Ember.Controller.extend({
  appName: 'Ember Twiddle',  
  result:Ember.computed(function(){
    return DS.PromiseObject.create({
    	promise: Ember.RSVP.resolve({name:'Kumkanillam'}).then((result) => { return result;})
 		 });
  })
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{#if result.isPending}}
  Loading...
{{else}}
  value: {{result.name}}
{{/if}}
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}