Assign serviceLocator to a custom view helper in Zend Framework 2

Module.php

<?php

namespace Application;

class Module{
  
  public function getViewHelperConfig() {
        return array(
            'factories' => array(
                'myHelper' => function($sm){
                    return new \Application\View\Helper\MyHelper($sm->getServiceLocator());
                }
            )
        );
    }
}

my-view.phtml

My helper do: <?php echo $this->myHelper();?>

MyHelper.php

<?php

namespace Application\View\Helper;

use Zend\View\Helper\AbstractHelper;

class MyHelper extends AbstractHelper {

    /**
     *
     * @var \Zend\ServiceManager\ServiceManager
     */
    private $sm;


    public function __construct(\Zend\ServiceManager\ServiceManager $sm) {
        $this->sm = $sm;
    }

    public function getSm() {
        return $this->sm;
    }

    public function __invoke() {

        $html = 'print this';
        return $html;
    }

}