Drupal 9 : How to exclude node from sitemap.xml

Sometimes we need to write some code to exclude nodes from the sitemap.xml based on custom conditions,

The XML sitemap module provides a hook to do this

function mymodule_xmlsitemap_link_alter(array &$link, array $context) {
  if (own_condition) {
      // status = 0 exclude the item in the sitemap.
      // access = 0 make the element non-accessible by the anonymous user.
        $link['status'] = 0;
        $link['access'] = 0;
    }
    else {
        $link['status'] = 1;
        $link['access'] = 1;
      }
    }
  }
}