Fill geom_text2 with background color

[Hovhannes Sahakyan]

Hello,

Please tell me if it is possible adding background color to geom_text2. It will cover the bottom layer and will make the labels clear. Below is an example.

tree <- rtree(25) ggtree(tree) + geom_text2(aes(label="D", subset=node==35))

I need the label "D" to be drawn on a white place.

Thank you!

Hovhannes