Use external link in the add sub menu

I want to show the data in the external plugins.php file. the below url path is correct but its not showing the file data. Whats the problem?

add_submenu_page( 'antify', 'Plugins', 'Plugins', 'manage_options', 'plugins', ANTIFY_PLUGIN_URL . '/admin/pages/plugins.php' );

plugins.php

<?php
echo 'Hello World';
?>