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How can I multiply the values of 2 Morph Targets together to output the value to a 3rd Morph Target?

On my face rig, what currently happens:
Controller move up = Morph Target A
Controller move right = Morph Target B
Controller move diagonally UP and RIGHT = Morph Target A & B together

What I would like to have happen is when the Controller moves diagonally UP and RIGHT, a third Morph Target (corrective shape) is activated based on the multiplication values of A & B, causing it to blend in perfectly, and further fine tuning the shape.

This can be done easily in Maya, was wondering if it’s possible in UE4?