New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appData : {
  	"title" : "First Title",
    "subtitles": [
      {
        "AMount":"4343"
	    },
      {
        "SNH":"4343"
	    }
     ]
  }
});

templates.application.hbs

{{#each-in  appData.subtitles as |subskey subsVal| }}
   <div>{{subskey}} : {{subsVal}} </div>
{{/each-in}}
<br>
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}