如何在woocommerce的新电子邮件订单中添加项目权重？

// 添加项目权重字段
add_action('woocommerce_new_order_item', 'add_order_item_weight', 10, 3);
function add_order_item_weight($item_id, $item, $order_id) {
    woocommerce_wp_text_input(
        array(
            'id'          => '_order_item_weight[' . $item_id . ']',
            'label'       => __('Item Weight', 'woocommerce'),
            'placeholder' => '',
            'desc_tip'    => 'true',
            'description' => __('Enter the weight of the item.', 'woocommerce'),
            'value'       => get_post_meta($item_id, '_order_item_weight', true),
        )
    );
}

// 保存项目权重字段值
add_action('woocommerce_checkout_create_order_line_item', 'save_order_item_weight', 10, 4);
function save_order_item_weight($item, $cart_item_key, $values, $order) {
    if (isset($values['_order_item_weight']) && !empty($values['_order_item_weight'])) {
        $weight = sanitize_text_field($values['_order_item_weight']);
        $item->add_meta_data('_order_item_weight', $weight, true);
    }
}

<?php foreach ($order->get_items() as $item_id => $item) : ?>
    <?php $weight = $item->get_meta('_order_item_weight', true); ?>
    <?php if ($weight) : ?>
        <p><strong><?php esc_html_e('Item Weight', 'woocommerce'); ?>:</strong> <?php echo esc_html($weight); ?></p>
    <?php endif; ?>
<?php endforeach; ?>