Adding a dynamic string to ContentArea

[GhekkoNL]

On a PushButton the action is to open a new MacosScaffold with a ContentArea.

ContentArea( builder: (context, _) { return Center( child: PushButton( controlSize: ControlSize.regular, child: const Text('Go Back'), onPressed: () { Navigator.of(context).maybePop(); }, ), ); }, ),

In a current project i'm working with dynamic strings to create pages.
On Android and Ios i'm able to use them like this:

onPressed: () { Navigator.pushNamed( context, Tab1Item1.routeTab1Items, arguments: index); },

Any idea on how I can use this on the "return" of the ContentArea?