How to add itemscope itemtype=”http://schema.org/WebPage” to html tag using function.php

`add_filter( ‘nav_menu_link_attributes’, ‘add_menu_attributes’, 10, 3 );

function jrod_add_html_manifest( $output ) {

$output .= ' itemscope itemtype="http://schema.org/WebPage"';

return $output;

}`