ivan vs Robert

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  session = {user: {name: 'Ivan'}};
}

helpers.session\.js

import Helper from '@ember/component/helper';
import {inject} from '@ember/service';

export default Helper.extend({
  session: inject('session'),
  
  compute() {
    return this.session;
  }
});

services.session\.js

import Service from '@ember/service';

export default Service.extend({
  user: {name: 'Robert'}
});

templates.application\.hbs

{{session.user.name}}

<MyComponent @prop={{session.user.name}}/>

templates.components.my-component\.hbs

{{prop}}

twiddle\.json

{
  "version": "0.17.0",
  "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/3.3.1/jquery.js",
    "ember": "3.17.0",
    "ember-template-compiler": "3.17.0",
    "ember-testing": "3.17.0"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}