Midi Learn for Insert Effects not working! Not in manual

I am trying to automate my equalizer from fabfilter. I also tried other EQs. All have midi learn. When I activate midi learn and tweak a parameter in note expression on one of my notes it doesnt work. However, when using fabfilters instrument twin 2 (which has the same interface) and use midi learn it works. It seems cubase simply cant make midi learn work for insert effects without a external controller.

Any help is appreciated