NavigationLink needs to be within the NavigationView hierarchy so you’ll need to be a bit creative with this.
Something like:
struct YourView: View {
@State private var isActive = false
@State private var goTo = “”
var body: some View {
NavigationView {
etc.
}
.background(
NavigationLink(destination: Text(self.goTo), isActive: $isActive) {
										EmptyView()
								})
}
}
And then for the toolbar all you need to do is:
.toolbar {
ToolbarItem(placement: .navigationBarLeading) {
Menu {
Button("Go to 1") {
										 self.goTo = "Destination 1"
										 self.isActive = true
								 }
								 Button("Go to 2") {
										 self.goTo = "Destination 2"
										 self.isActive = true
								 }
}
label: {
Label("Add", systemImage: "plus")
}
}		
}
Can’t get the indentation right for your code, for some reason the editor doesn’t play nice, but I think you’ll be able to figure it out.