Add custom post type as submenu

I have a custom post type called ‘Movies‘ that I want to add under WooCommerce menu after "Extensions" as you can see below:

enter image description here

The WooCommerce page URL is /wp-admin/admin.php?page=wc-admin

I tried:

register_post_type( 'movie', array(     'show_in_menu' => 'admin.php?page=wc-admin' ) ); 

but that didn’t work. I am able to set Movies under Tools, Settings, Post, etc everywhere else, just not inside WooCommerce. Any ideas why?