Instead of ScatterPointSeries you can check if the RangeSeries
will work for your scenario. The series work with range data - each data point has a category, high and low values. So, you can use it to define the area between the data points. You can use its Stroke and StrokeThicknes properties to set the border of the area (the lines between the data points). However, the RangeSeries is a categorical series and you will need to plot with a categorical axis.
If you insist using scatter series you will need to implement custom logic that draws the area between the scatter points. For example, you can use a custom annotation
and based on the plotted data create a Path with the area and assign it as Content of the annotation. Another approach is to use a Canvas placed over the chart and draw the custom Path there.
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