New Twiddle

components.my-component\.js

import Component from '@glimmer/component';
import { inject as service } from '@ember/service';
import { tracked } from '@glimmer/tracking';
import { action } from '@ember/object';

export default class extends Component {
  @service router;
  
  @tracked
  counter;
  
  get displayCounter() {
   return this.counter ?? this.args.counter;
  }

	@action
	increment() {
   this.counter = this.displayCounter + 1;
  }
  
  @action
  reload() {
    debugger;
    // this.router.transitionTo('/');
    this.args.refreshRoute();
  }
}

components.my-route\.js

import Component from '@glimmer/component';

export default class extends Component {
}

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';

	@action
  reloadModel() {
    this.send('refreshRoute');
  }
}

controllers.my-route\.js

import Controller from '@ember/controller';

export default Controller.extend({
});

router\.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('my-route');
});

export default Router;

routes.application\.js

import Route from '@ember/routing/route';
import { action } from '@ember/object';

export default class AppRoute extends Route {

  async model() {
    return {
    	counter: 1,
      refreshRoute: this.refreshRoute,
    }
  }
  
  @action
  refreshRoute() {
    console.log('in======');
  	this.refresh();
  }
}

routes.my-route\.js

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

export default Route.extend({
});

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<br>
{{outlet}}
<MyComponent @counter={{@model.counter}} @refreshRoute={{this.reloadModel}}/>
<br>
<br>

templates.components.my-component\.hbs

counter: {{this.displayCounter}}
<br/>
<br/>
<button {{on 'click' this.increment}}>Increment Counter</button>
<button {{on 'click' this.reload}}>Reload</button>

templates.components.my-route\.hbs

<MyComponent @counter={{this.counter}}/>

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": "3.17.3",
    "ember-template-compiler": "3.17.3",
    "ember-testing": "3.17.3"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}