Need to merge extra field in getJsonResponse result using custom plugin
public function aroundExecute(VendorApiControllerProductPage $subject, Closure $proceed) { $productId = $this->request->getParam(“productId”); $this->product = $this->productFactory->create()->load($productId); $title = $this->product->getData(‘title’); $extraInfo[‘title’] = $title; $this->returnArray[“extra”] = $extraInfo; return $this->returnArray; }