Autowire a Symfony parameter

Add a parameter in config/services.yaml:

parameters:
    app_custom_param: 'My custom param!

Autowire the param:

use Symfony\Component\DependencyInjection\Attribute\Autowire;

class MainController extends AbstractController
{
    public function homepage(
        #[Autowire(param: 'app_custom_param')]
        $appCustomParam,
    ): Response {
      dd($appCustomParam);
    }
}