Swiftui navigation link to a qlpreview - property initialisers run before 'self' is available

Question

Very new to coding and trying to teach myself swift. Running into a problem that I am having trouble understanding. Apologies if my code is a mess or my question is not clear.

I am creating a navigationview from a list I have created. I would like each list item to link to a detail page, that has a button opening a qlpreview of a word document, specific to that list item.

Firstly I have set the structure of my list items:

struct ScriptItem: Identifiable {
    let id = UUID()
    let ex: String
    let phase: String
    let doc: String
}

I then have my list and navigationview struct set up to link to a detailed view

struct ScriptsView: View {
    
    @State private var queryString = ""
    
    private let scriptList: [ScriptItem] = [
    ScriptItem(ex: "101",
               phase: "HMI",
               doc: "PILOT NOTES  EX 101"),
    ScriptItem(ex: "102",
               phase: "HMI",
               doc: "PILOT NOTES  EX 201")].sorted(by: {$0.ex < $1.ex})
    
    var filteredScript: [ScriptItem] {
        if queryString.isEmpty {
            return scriptList
        } else {
            return scriptList.filter {
                $0.ex.lowercased().contains(queryString.lowercased()) == true || $0.phase.lowercased().contains(queryString.lowercased()) == true
            }
        }
    }
    
    var body: some View {
        NavigationView {
            List(filteredScript) { scriptItem in
                NavigationLink(destination: ScriptDetails(scriptitem: scriptItem)) {
                    HStack {
                        ZStack {
                            Text(scriptItem.ex)
                        }
                        Text(scriptItem.phase)
                    }
                }
            } .navigationBarTitle("Exercise Scripts")
        } .searchable(text: $queryString, placement: .navigationBarDrawer(displayMode: .always), prompt: "Script Search")
    }
}

My problem is in the next section - in the detail struct I'm trying to create a url link using forResource: but when I use the string from the previous struct I get the following error:

CANNOT USE INSTANCE MEMBER 'SCRIPTITEM' WITHIN PROPERTY INITIALIZER. PROPERTY INITIALIZERS RUN BEFORE 'SELF' IS AVAILABLE.

struct ScriptDetails: View {
    
    let scriptitem: ScriptItem
    
    let fileUrl = Bundle.main.url(
        forResource: scriptitem.doc, withExtension: "docx"
       )
 ETC ETC ETC

Is there a way around this error that allows me to refer to the string I need from the previous struct?