3_emoji-type.php

<?php

// The form
namespace App\Form;

use App\Entity\Address;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class AddressType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder
            ->add('country', EmojiType::class)
        ;
    }

    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver->setDefaults([
            'data_class' => Address::class,
        ]);
    }
}

namespace App\Controller;

use App\Form\AddressType;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

// The controller
class HelloController extends AbstractController
{
    #[Route('/hello', name: 'hello')]
    public function index(): Response
    {
        $form = $this->createForm(AddressType::class);

        return $this->render('hello/index.html.twig', [
            'form' => $form->createView()
        ]);
    }
}

// twig

<div class="example-wrapper">
    <h1>Address form </h1>
    {{ form(form) }}
</div>