show full week in charts even when days are empty

Hi,

im building a swiftui chart for showing hours per day. it works fine. but I want to display a whole week even if there is no data on several days. it is based on core data.

does anyone know how to modify x axis to show always the full week?

thx Chris

Chart
                {
                    ForEach(zeiten, id: \.self.startdatum?.weekDay)
                    {
                        zeit in
                        BarMark(
                            x: .value("day", zeit.startdatum ?? Date(), unit: .day),
                            yStart: .value("Low", zeit.startzeit?.timeDouble ?? 0),
                            yEnd: .value("High", zeit.endzeit?.timeDouble ?? 0))
                    }
                    .cornerRadius(8)
                    .foregroundStyle(.userGreen)
                }
                .frame(width: geometry.size.width*0.75, height: 90)
                .padding()
                .chartYScale(domain: 0...24)
                .chartXAxis {
                    AxisMarks(values: .stride(by: .day, count: 1)) { _ in
                            AxisValueLabel(format: .dateTime.weekday(.narrow))
                            AxisGridLine()
                            AxisTick()
                    }
                }