Include sitemap

<?php
include_once 'custom-sitemap.php';
add_filter('rank_math/sitemap/providers', function( $external_providers ) {
    $external_providers['custom'] = new \RankMath\Sitemap\Providers\Custom();
    return $external_providers;
});

add_filter( 'rank_math/sitemap/entry', function( $url, $type, $object ) {
    if ( 'post' == $type ) {
        if ( $object->ID == 457 ) {
            return false; // Remove this entry from the sitemap
        }

        if ( $object->post_parent == 457 ) {
            return false; // Remove this entry from the sitemap
        }
    }

    return $url; // Return the URL if it doesn't match the exclusion criteria
}, 10, 3 );

add_filter( 'rank_math/sitemap/enable_caching', '__return_false');