Loading an object in a Zend Form Select using Doctrine - Zend Expressive 1.0?

Question

Doctrine ORM

How can I load data from the database into the form (drop-down list element) using doctrine (Doctrine ORM), using the Zend Expressive and ZendForm framework. It used to be possible with DoctrineModule or DoctrineORMModule for Zend Framework 2, but it is no longer compatible with Zend Expressive.
Deprecated method:

$this->add(array(
           'name' => 'continent',
           'type' => 'DoctrineModule\Form\Element\ObjectSelect',
           'options' => array(
                'object_manager'     => $this->entityManager,
                'target_class'       => 'Tutorial\Entity\Countries',
                'property' => 'continent',
                'is_method' => true,
                'find_method'        => array(
                    'name'   => 'getContinent',
                ),
            ), 
        ));