New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({

  tooltipsContent: {
		pageViewCount: 'Hello!',
  	uniqueVisitorCount: 'Bye'
	},
                                       
  items: ['pageViewCount', 'uniqueVisitorCount', 'more']
});

templates.application.hbs

{{#each items as |item|}}
  {{#if (get tooltipsContent item)}}
  	Show tooltip: 
    {{get tooltipsContent item}}
  {{else}}
    No content :( 
  {{/if}}
  <br/>
{{/each}}

twiddle.json

{
  "version": "0.14.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "2.18.2",
    "ember-template-compiler": "2.18.2",
    "ember-testing": "2.18.2"
  },
  "addons": {
    "ember-data": "2.18.2"
  }
}