generateExportPreview example

public function __construct(
        private readonly EntityRepository $salesChannelDomainRepository,
        private readonly EntityRepository $salesChannelRepository,
        private readonly ProductExportGeneratorInterface $productExportGenerator,
        private readonly EventDispatcherInterface $eventDispatcher
    ) {
    }

    #[Route(path: '/api/_action/product-export/validate', name: 'api.action.product_export.validate', methods: ['POST'])]     public function validate(RequestDataBag $dataBag, Context $context): JsonResponse
    {
        $result = $this->generateExportPreview($dataBag, $context);

        if ($result && $result->hasErrors()) {
            $errors = $result->getErrors();
            $errorMessages = array_merge(
                ...array_map(
                    fn (Error $error) => $error->getErrorMessages(),
                    $errors
                )
            );

            return new JsonResponse(
                [