“Posts” Widget Query’ing “Siblings of active page”

It would be so nice if the “Posts” element could automatically display all “Siblings(Childs of the parent of that active page)”.

For example, sometimes I have a “A specific service” page with 10 sibling-pages. I’m adding a “Posts” Element to the every other “Service” pages.

Right now, I have to select each sibling-pages via “manual selection”. This is fine when there are just a few pages. But when the list is long or frequently updated, it can be tedious.

I know there is a way to create custom “Query ID” for childs of a page:

add_action( 'elementor/query/ChildOfThisPage', function( $query ) {
	// Get current post tags
	$current_page = get_queried_object_id();
	// Modify the query
	$query->set( 'post_parent', $current_page );
} );

But as I said I’m not able to get sibling pages.

I’ll be very happy if someone help me to get them. Thank you.