<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="MagentoCatalogBlockProductImage">
        <plugin name="Wishlist_Count::Count" type="WishlistCountPluginCatalogProductWishcount"/>
    </type>
</config>

namespace WishlistCountPluginCatalogProductView;
class Wishcount
{
    protected $_helper;
    protected $scopeConfig;

    public function __construct(
        WishlistCountHelperData $helper,
        MagentoFrameworkAppConfigScopeConfigInterface $scopeConfig
    ) {
        $this->_helper = $helper;
        $this->_scopeConfig = $scopeConfig;
    }
    public function afterToHtml(
        MagentoCatalogBlockProductViewGallery $subject,
        $result
    ) {
        $product = $subject->getProduct();
        $template = $subject->getTemplate();//view/frontend/templates/product/view/gallery.phtml
        $name = $subject->getNameInLayout();
        if ($product && $name == "product.info.media.image") {
            $result .= $this->_helper->renderWishlistCount( $product );
        }
        return $result;
    } }

namespace WishlistCountHelper;
use MagentoFrameworkAppFilesystemDirectoryList;
use MagentoStoreModelScopeInterface;

class Data extends MagentoFrameworkAppHelperAbstractHelper
{
    protected $_storeManager;
    protected $_counts;
    protected $_registry;
    protected $_resultPageFactory;
    protected $_objectManager;
    protected $_messageManager;
    protected $_scopeConfig;
    protected $_statusId = null;
    private $layoutFactory;
    private $_productTypeConfigurable;

    public function __construct(
        MagentoFrameworkRegistry $registry,
        MagentoFrameworkViewResultPageFactory $resultPageFactory,
        MagentoFrameworkObjectManagerInterface $objectManager,
        MagentoFrameworkMessageManagerInterface $messageManager,
        MagentoStoreModelStoreManagerInterface $storeManager,
        MagentoFrameworkViewLayoutFactory $layoutFactory,
        MagentoConfigurableProductModelProductTypeConfigurable $catalogProductTypeConfigurable,
        MagentoFrameworkAppHelperContext $context
    ) {
        parent::__construct($context);
        $this->_registry = $registry;
        $this->_resultPageFactory = $resultPageFactory;
        $this->_objectManager = $objectManager;
        $this->_messageManager = $messageManager;
        $this->_scopeConfig = $context->getScopeConfig();
        $this->_storeManager = $storeManager;
        $this->layoutFactory = $layoutFactory;
        $this->_productTypeConfigurable = $catalogProductTypeConfigurable;
    }

    public function renderWishlistCount(MagentoCatalogModelProduct $product)
    {
        $html = '';

        $id    = $this->_storeManager->getStore(true)->getId();
        $model = $this->_objectManager->create('MagentoWishlistModelWishlist');
        $html = $model->getCollection()
            ->addFieldToFilter('store_id', ['like' => "%$id%"])
            ->addFieldToFilter('product_id', ['like' => "%$product->getId()%"])

        return $html;
    }
}