Triple curly

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  
  model(){
  	return ['<img src="123.png"></img>', '&lt;img src=&quot;test.png&quot;/&gt'];
  }
  
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>

{{#each model as |item| }}
	{{{item}}}<br><br>
{{/each}}

<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.7.0",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.7.0"
  },
  "addons": {}
}