Hi Cinderclaw,
using a 3D widget (see How-To from docs) you can create a widget an place it as a normal actor in your scene. You can arbitrary rotate and transform this actor/widget to achieve the Perspective Text. Time being, there are still some issues with these 3D widgets (see e.g. problem with EditableTextBox).
With the normal, not 3D widget, you can only modify the Translation and Shear from the Render Transform menu of a TextBlock.