Add custom Doctrine query hints in Neos Flow

EntityManagerConfiguration.php

<?php
namespace Acme\Demo\Persistence\Doctrine;

use Doctrine\DBAL\DBALException;
use Doctrine\ORM\Configuration;
use Doctrine\ORM\EntityManager;
use Doctrine\ORM\Query;
use Gedmo\Translatable\Query\TreeWalker\TranslationWalker;
use Gedmo\Translatable\TranslatableListener;

/**
 * @Flow\Scope("singleton")
 */
class EntityManagerConfiguration
{

    /**
     * Enhance the Doctrine EntityManager by applying post creation settings, like custom filters.
     *
     * @param Configuration $config
     * @param EntityManager $entityManager
     * @throws DBALException
     */
    public function enhanceEntityManager(Configuration $config, EntityManager $entityManager): void
    {
        // Check sandstorm/gedmotranslatableconnector for setting up Gedmo Translatable in Neos Flow (https://github.com/sandstorm/GedmoTranslatableConnector)
        $config->setDefaultQueryHint(Query::HINT_CUSTOM_OUTPUT_WALKER, TranslationWalker::class);
        $config->setDefaultQueryHint(TranslatableListener::HINT_TRANSLATABLE_LOCALE, 'en');
        $config->setDefaultQueryHint(TranslatableListener::HINT_FALLBACK, 1);
    }
}

Package.php

<?php

namespace Acme\Demo;

use Doctrine\ORM\Mapping\Driver\AnnotationDriver;
use Neos\Flow\Persistence\Doctrine\EntityManagerFactory;

/**
 * @package Acme\Demo
 */
class Package extends \Neos\Flow\Package\Package
{
    public function boot(\Neos\Flow\Core\Bootstrap $bootstrap)
    {
        $bootstrap->getSignalSlotDispatcher()->connect(EntityManagerFactory::class, 'afterDoctrineEntityManagerCreation', \Acme\Demo\Persistence\Doctrine\EntityManagerConfiguration::class, 'enhanceEntityManager');
    }
}