add_action('wishlist_archive_main', 'wishlist_archive_main_20201908', 5);
function wishlist_archive_main_20201908($args){
//echo '<pre>'.var_export($args, true).'</pre>';
?>
<span>Custom HTML here</span>
<?php
} 
add_action('wishlist_archive_main', 'wishlist_archive_main_20201908', 5);
function wishlist_archive_main_20201908($args){
//echo '<pre>'.var_export($args, true).'</pre>';
?>
<span>Custom HTML here</span>
<?php
}