How to align text?

I'm trying to create a custom control similar to a DisclosureGroup.

I would like to align the leading edges of "11" and "First". There is a Button preceding "First", but none preceding "11".

Bonus question. I'm using SF Symbols for the arrows, but I would like to use the > and V used in DisclosureGroup. Are those symbols available?

Thanks, Mark

    var body: some View {
        List(items, selection: $selection) { master in
            HStack {
                if master.master {
                    Button {
                        if master.master {
                            expanded.formSymmetricDifference([master.id])
                        }
                    } label: {
                        Image(systemName: expanded.contains(master.id) ? "arrowtriangle.down" : "arrowtriangle.forward")
                    }
                    .buttonStyle(BorderlessButtonStyle())
                }
                Text(master.name)
            }
        }
        .frame(width: 200)
    }