[WooCommerce] Add missing Schema

functions.php

/**
 * Title: Add missing Schema WooCommerce 
 * Author: Mattias Ghodsian
 * Donate a cup of coffee: https://www.buymeacoffee.com/mattiasghodsian
 * Donate Eth: 0xBBB96204E45D11C9799c6B12E6eE6F0d4A071Ef5
**/
function woo_missing_schema_fields($data) {

    global $product;

    $images = $product->get_gallery_image_ids();
    
    $data['brand'] = "Festmäklarna";

    $data['aggregateRating'] = [
        "ratingValue" => ( $product->get_average_rating() ? $product->get_average_rating() : '3.0'),
        "reviewCount" => ( $product->get_review_count() ? $product->get_review_count() : '1')
    ];

    // $data['gtin8'] = ""; //  gtin8, gtin12, gtin13, gtin14, mpn, isbn 

    if ( ! ( $images ) ) { 
        $data['image'] = get_site_url()."/wp-content/uploads/images/ingen_bild.png";
    }else{
        $data['image'] = wp_get_attachment_image_src( $images[0], 'full' )[0];
    }

    return $data;
}
add_filter( 'woocommerce_structured_data_product', 'woo_missing_schema_fields' );