You can define the chart axis next to each other by using the native chart control. This customization required subscribing to the handler changed and add additional logic to access the native chart and series. So in this case you have one chart definition and two series:
I have attached the xaml and cs files used for this approach and an image on WinUI. In general if you want to further customize the chart you need to use the native chart controls. The chart is a native control, so we have iOS/Android and WinUI charts and they follow the platform guidelines. So there isn't a 100% matching across the platform.
I hope the provided approach will be of help for the scenario you are looking for. If you have any additional questions, I will be glad to assist further.