Blendshape drivers within unity?

What I would like to know is if anybody knows how to either import the blendshape driver information directly from a 3d modelling package or how to set up blendshape drivers within unity itself. What I mean by driver, is according to x,y,z bone rotation (or location for faces), blendshapes activate from 0 to 100. For example from 90-130 degress on the x axis, the blendshapes slowly triggers according to its rotation.

Now from what I have read there is no way to import this, but I would still like a deffinitive answer.

Is there a way to edit an animation in unity and specify the blendshape amount you want at each keyframe of a specific animation?

I am asking this after many hours of research on the net and Unity Answers with no luck. The project I am currently working requires detailed facial rigs as well as blendshape correctives on parts of the body to get muscle deformation correct.

Thanks,