add_action('wishlist_single_meta', 'wishlist_single_meta_20201908', 0);

function wishlist_single_meta_20201908($atts){

    $wishlist_id = isset( $atts['id'] ) ? $atts['id'] : 0;

    //echo '<pre>'.var_export($wishlist_id, true).'</pre>';

    ?>
    <span>Custom HTML here</span>
    <?php
}

 

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