Set Priority to specific page

Already done 🙂

We have added below filters with 1.7.2 version:

• sitemap_post_priority
• sitemap_post_frequency
• sitemap_term_priority
• sitemap_term_frequency

Here is an example for you:

add_filter( 'sitemap_post_priority', 'my_sitemap_post_priority', 10, 2 );
function my_sitemap_post_priority( $priority, $post ) {
    if ( $post->ID === 1 ) {
        $priority = 9; // priority from 0 to 10
    }
    return $priority;
}

Please let us know if you need anything else.

Best regards