How can I show the numerical value of the last data point in a ScatterLineSeries on an XamDataChart?

We need to show the last value for each curve on the chart just to the right of where the last data point was plotted.  Only the last data point needs a number label.

a. The graph is updated in real time at about 1 point for each series every 1 second.  There are 1 to 12 series on the graph depending on user settings.

b. Each series on the chart is updated at different time intervals as they come from different hardware devices.   The last data point for the different series may such that one series takes up the entire graph X-Axis and another takes up 75% of the graph X-Axis.  The labels need to be in the middle of the graph if the last data point for the series is in the middle of the graph.

c. The data for the curves generally varies widely causing the Y and X axes to automatically adjust the visible range.   Many of the curves resemble criss-crossing sine waves with ampltudes taking up most of the visible area of the graph when the graph is not zoomed in.

d. We already have a way to show the last 10 minutes of data and add padding to the right of the graph enough to allow for a last data point number label.

e. These graphs are run for hardware collection and can run from 1 to 15 hours

It would greatly help if there is a way to adjust the last data point label up or down slightly to help reduce, but not elliminate, the overlap between labels