How can I make a new item from within a navigationlink?

Sorry if this is too basic, but I really can't figure out how to make this work.

I am trying to make a journal app and I want to have a button that creates a new journalentry and then loads it. This code snippet (I removed irrelevant bits) shows how I'm trying to go about it. Basically, the newEntryButtons should launch a JournalPromptRoute for one of the different options: that's the method argument. But putting .createNewEntry() inside the argument means that new entries are being constantly created. I want the system to create a new entry once on the button press and then go to it from the navigationDestination area.

Can anyone please explain to me how this is supposed to work? I believe the code snippet is detailed enough to get the point across but please let me know if you need more info.

    case library
    case blank(entry: Entry)
    case mystery
    case summary(entry: Entry)
    case entry(entry: Entry)
}

struct JournalHome: View {
    @ObservedObject var viewModel: JournalViewModel
    
    var mainContent: some View {
        ScrollView {
            newEntryButtons
            LazyVStack {
                ForEach(filteredEntries) { entry in
                    NavigationLink(
                        value: JournalPromptRoute.entry(entry: entry)
                    ) {
                        JournalCard(entry)
                    }
                }
            }
        }
    }

    var body: some View {
        NavigationStack(path: $path) {
            mainContent
            .navigationDestination(for: JournalPromptRoute.self) { route in
                switch route {
                case .blank(let entry):
                    JournalEntryView(
                        entry: entry,
                        index: 0,
                        viewModel: viewModel
                    )
                }
            }
        }
    }

    var newEntryButtons: some View {
        ScrollView(.horizontal) {
            HStack(spacing: 15) {
                EntryButton(
                    description: "Add blank entry",
                    method: JournalPromptRoute.blank(entry: viewModel.createNewEntry()),
                    viewModel: viewModel,
                    path: $path
                )
                EntryButton(
                    description: "Select a Journey",
                    method: JournalPromptRoute.library,
                    viewModel: viewModel,
                    path: $path
                )
                EntryButton(
                    description: "Let the Journey find you",
                    method: JournalPromptRoute.mystery,
                    viewModel: viewModel,
                    path: $path
                )
            }
        }
    }
}