change back button title not work

none of them works, is it possible to work?
```
.introspect(.navigationStack, on: .iOS(.v16,.v17)) { (nv: UINavigationController) in
        nv.navigationBar.topItem?.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
        nv.navigationBar.backItem?.title = "some"
        nv.navigationBar.backItem?.backButtonTitle = "some"
}
```