Charts: position of HTMLLabelItem

I want to show HTMLLabelItems in the corners of my scatter-chart.
I’m trying to position each HTMLLabelItem with StylePosition.RELATIVE, but the api has only methods for top and left.
For the upper left corner, this works:

HTMLLabelItem htmlItem = new HTMLLabelItem("NorthEast"); Style style = new Style(); style.setPosition(StylePosition.RELATIVE); style.setLeft("10"); style.setTop("10"); htmlItem.setStyle(style); How can I position the items in the upper right / lower right / lower left corner ?
I tried to use percentage-based values, but this doesn’t work.

Any suggestions?