wat

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
}

routes.application\.js

import Route from '@ember/routing/route';

export default Route.extend({
  
  model() {
    return {
      items: { 
        key: 'value',
      }
    } 
  }
});

templates.application\.hbs

{{#each-in @model.items as |key value|}}
  {{key}}: {{value}}
  {{log 'item' key value}}
{{/each-in}}

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}