Tabs with an external Link

Is there a solution / workaround to add an Tab with a (external) link?

For example:

'tabs'      => array(
            'contact' => array(
                'label' => __( 'Search', 'rwmb' ),
                'icon'  => 'dashicons-external', // Dashicon
                'url' => 'http://www.google.com',
                'external' => true
            ),
            'social'  => array(
                'label' => __( 'Themes', 'rwmb' ),
                'icon'  => 'dashicons-share', // Dashicon
                'url' => trailingslashit( admin_url() ) . 'themes.php,
            ),
            'note'    => array(
                'label' => __( 'Note', 'rwmb' ),
                'icon'  => 'http://i.imgur.com/nJtag1q.png', // Custom icon, using image
            ),
        ),