Presently, there is no way to achieve this with out-of-the-box means.
However, I can suggest a work-around for this. In a resume you will need to wait for the item labels to get populated into the chart and then you can adjust their margins. I have pasted some code below that should help you.
sender, EventArgs e)
var labelsPanel = Telerik.Windows.Controls.ChildrenOfTypeExtensions.FindChildByType<LabelsPanel>(
|| labelsPanel.Children.Count == 0)
var first = labelsPanel.Children.First();
var last = labelsPanel.Children.Last();
(seriesItemLabel == first || seriesItemLabel == last)
leftAdjustment = -(seriesItemLabel.ActualWidth / 2 + 5);
Thickness(leftAdjustment, 0, 0, 0);
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