在Symfony中，如何调用Menubuilder中的控制器函数？

services:
    App\Menu\MyMenuBuilder:
        tags: ['knp_menu.menu_builder', 'knp_menu.menu_provider']

namespace App\Menu;

use Knp\Menu\FactoryInterface;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
use Knp\Menu\ItemInterface;
use Knp\Menu\MenuBuilderInterface;

class MyMenuBuilder implements MenuBuilderInterface
{
    private $factory;
    private $urlGenerator;
    private $requestStack;

    public function __construct(FactoryInterface $factory, UrlGeneratorInterface $urlGenerator, RequestStack $requestStack)
    {
        $this->factory = $factory;
        $this->urlGenerator = $urlGenerator;
        $this->requestStack = $requestStack;
    }

    public function createMainMenu(array $options): ItemInterface
    {
        $menu = $this->factory->createItem('root');

        // 添加菜单项
        $menu->addChild('Home', ['route' => 'homepage']);
        $menu->addChild('About', ['route' => 'about']);

        // 调用控制器函数
        $menu->addChild('Contact', [
            'uri' => $this->urlGenerator->generate('contact', [
                'param' => $this->requestStack->getCurrentRequest()->get('param')
            ])
        ]);

        return $menu;
    }
}

namespace App\Controller;

use App\Menu\MyMenuBuilder;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;

class MyController extends AbstractController
{
    public function index(MyMenuBuilder $menuBuilder): Response
    {
        // 调用菜单构建器中的函数
        $menu = $menuBuilder->createMainMenu([]);

        // 其他控制器逻辑...

        return $this->render('my_template.html.twig', [
            'menu' => $menu,
        ]);
    }
}