I'm currently customizing the back button in SwiftUI manually screen by screen, how do I make this change global?

My original goal was to adjust the back button so it did not include the "back" text. But my current implementation requires adding the following code to each screen that needs a back button. How can I take this code which is on multiple screens and make it a more global change?

    @Environment(\.presentationMode) var presentationMode

// Whatever content
        .toolbar {
            ToolbarItem(placement: .navigationBarLeading) {
                Button(action: {
                    self.presentationMode.wrappedValue.dismiss()
                }) {
                    HStack {
                        Image(systemName: "arrow.left")
                            .foregroundColor(.black)
                            .font(.headline)
                    }
                }
            }
        }

The result:

Any help on making this change global will be much appreciated

Thank you to @rapiddevice for pointing out I can make a custom modifier which makes things A LOT easier.

import SwiftUI

struct CustomBackButton: ViewModifier {
    
    @Environment(\.presentationMode) var presentationMode

    func body(content: Content) -> some View {
        content
            .navigationBarBackButtonHidden(true)
            .toolbar {
                ToolbarItem(placement: .navigationBarLeading) {
                    Button(action: {
                        self.presentationMode.wrappedValue.dismiss()
                    }) {
                        HStack {
                            Image(systemName: "arrow.left")
                                .foregroundColor(.black)
                                .font(.headline)
                        }
                    }
                }
            }
    }
}

extension View {
    func customBackButton() -> some View {
        modifier(CustomBackButton())
    }
}