Is it possible to set the background color for a data label?

[Scheissy]

Hey guys! I'm looking for a way to set the background color of a label in a (bar) chart. With $series->getFont()->getColor()->setRGB($color); it is possible to change the font color for the label. I was hoping for something similar for the background color, but the Font class doesn't have a background color attribute and the Outline object for a Series only changes the outline (color) of the bar. I'm currently using the "dev-develop" release of the package. Thanks for any ideas!