How to add a custom 'CreateRecord Page' to the sidebar navigation?

If I use

->navigation(function (NavigationBuilder $builder): NavigationBuilder {
  return $builder->items([...]); 
});

->navigation(function (NavigationBuilder $builder): NavigationBuilder {
  return $builder->items([...]); 
});

I am replacing the default navigation items, including those that are added through plugins. Is there a method I can use with

$builder->items([...this_method_calls_default_nav_items()...])

$builder->items([...this_method_calls_default_nav_items()...])

so that I can retrieve the default navigation items?