Does control rig have the ability to create correctional blendshapes?
If you take a look at the Metahuman Control Post Process Rig, you’ll see a lot of Pose Driver nodes, which are driving joints based on a pre-baked animation that moves/rotate/scale corrective joints, so the a “corrective shape” pose can be achieved.
If instead you have a corrective shape that you want to trigger, you can take a look at the content example, there’s a cube that changes shape and color, driven by a float via Blueprint.
If instead you mean if the control rig itself is able to create a shape, the answer is no…but you can always try the ML Deformer in UE5 
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Thank you, looking forward to this.