可以使用过滤器进行更改

add_filter(\'wp_get_nav_menu_items\', \'add_utm_to_links\', 10, 3);

function add_utm_to_links($items, $menu, $args) {

    foreach($items as $item) {
        if(!empty($item->url)) {
            $item->url .=  strchr($url, \'?\') === false ? \'?\' : \'&\';  
            $item->url .= \'utm=value\';
        }
    }

    return $items;
}