Allow NavigationViewItem Display in the Center at the Bottom

[MyBlueHorizon]

Is your feature request related to a problem? Please describe

If you want to get NavigationViewItem display in here, it's hard to set. You need to set the Margin of PaneHeader and PaneHeader to a special value, and it is very hard to set.

Describe the solution you'd like

Add a option to allow NavigationViewItem display in center, just like the taskbar of Windows 11.

Describe alternatives you've considered

No response

Additional context

No response