Instead of using a SeriesItemLabelStyle with converter, you can attach to RadChart's LayoutUpdated event and change the visibility of all of the labels, except for the first and the last, by finding them in the visual tree:
.chart.LayoutUpdated += Chart_LayoutUpdated;
sender, EventArgs e)
var labelsPanel =
(labels.Count < 1)
i = 1; i < labels.Count - 1; i++)
labels[i].Visibility = Visibility.Collapsed;
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