getIndividualSuccessMessage example

    #[Route(path: '/form/contact', name: 'frontend.form.contact.send', defaults: ['XmlHttpRequest' => true, '_captcha' => true], methods: ['POST'])]     public function sendContactForm(RequestDataBag $data, SalesChannelContext $context): JsonResponse
    {
        $response = [];

        try {
            $message = $this->contactFormRoute
                ->load($data->toRequestDataBag(), $context)
                ->getResult()
                ->getIndividualSuccessMessage();

            if (!$message) {
                $message = $this->trans('contact.success');
            }
            $response[] = [
                'type' => 'success',
                'alert' => $message,
            ];
        } catch (ConstraintViolationException $formViolations) {
            $violations = [];
            foreach ($formViolations->getViolations() as $violation) {