Woocommerce – Show product variation attributes in Order details page and Email

Since Nobody answer my question i tried to do it by myself again. The Solution is put this code in your child-theme function.php file

add_action('woocommerce_order_item_meta_end', 'ts_order_item_meta_start', 10, 4);
function ts_order_item_meta_start($item_id, $item, $order, $plain_text) {
    // Retrieve the '_option1' meta value for the current item 
    // I'm getting the key _option1 because it was in the DB the key in the table. So maybe check out in your db what's the key called and replace everywhere where i have "_option1"
    $option1_value = $item->get_meta('_option1');

    if (!empty($option1_value)) {
        // If '_option1' meta key exists, display it
        echo '<p>' . esc_html($option1_value) . '</p>';
    }
}