how to add a div inside wp_page_menu

by

The question is light on detail but I’d lean toward a custom Walker:

class My_Page_Walker extends Walker_Page {
  function end_el( &$output, $page, $depth = 0, $args = array() ) {
    $output .= '<span>After the Anchor</span></li>';
  }
}

$args = array(
  'walker' => new My_Page_Walker
);
wp_list_pages( $args );

That should insert content just before the closing </li> with is what I think you want.