Using Journal to Access Feature Attributes in PostBuilder

I use feature based machining in NX (find features). I am programming an EDM drill. I use NX only for positioning and my post spits out all of the necessary macro commands for the machine. I need to find a way to access the "depth" attribute that is associated with the feature. There is no post builder variable associated with this value. I can see the value under the features tab in manufacturing so I assume this value is stored somewhere. I can also alter this value. Does anyone have any experience with setting post builder variables with journals/API? Thanks!!