Auto add (multiple) Custom Post Types to menu

I'm trying to add custom post types entries automatically as submenu's to my main menu. I've managed to add one CPT nestjes by using the code below.

Now I would like to add two more CPT's automatically to my menu on the same website: poezen and katers. How do I blend in these variables in the code below?

• my_theme_poezen_menu_filter

• poezen-parent-item

• poezen-post-type

• my_theme_katers_menu_filter

• katers-parent-item

• katers-post-type

Thank you for the help.

add_filter( 'wp_get_nav_menu_items', 'my_theme_nestjes_menu_filter',10, 3 );

function my_theme_nestjes_menu_filter( $items, $menu, $args ) {
  $child_items = array(); 
  $menu_order = count($items); 
  $parent_item_id = 0; 

  
  foreach ( $items as $item ) {
    if ( in_array('nestjes-parent-item', $item-classes) ){
        $parent_item_id = $item-ID;
    }
  }

  if($parent_item_id  0){

      foreach ( get_posts( 'post_type=nestjes-post-typenumberposts=-1' ) as $post ) {
        $post-menu_item_parent = $parent_item_id;
        $post-post_type = 'nav_menu_item';
        $post-object = 'custom';
        $post-type = 'custom';
        $post-menu_order = ++$menu_order;
        $post-title = $post-post_title;
        $post-url = get_permalink( $post-ID );
        array_push($child_items, $post);
      }

  }

  return array_merge( $items, $child_items );
}