Ah, yes in the new development version there is a filter xmlsf_news_filter_post_types
available.
If you have your own theme or are using a child theme you could do this:
1. Go to https://github.com/RavanH/xml-sitemap-feed and use the green button on the top right to download a zip with the plugin files.
2. Unzip the files and upload them via FTP, overwriting the current plugin files.
3. Open your child theme functions.php and add the following code:
function my_news_post_types( $post_types ) {
$post_types[] = 'page';
return $post_types;
}
add_filter( 'xmlsf_news_post_types', 'my_news_post_types', 11 );
You will then have to go to Settings > Google News and switch post type to Page.