How to insert keyframes for the "Dimensions" value?

So I’m appying Simple Deform “Twist” modifier on a simple cube, and the only things that change are the values under “Dimensions”. I press “I” to insert a keyframe and I don’t see a way where I could insert keyframes for the Dimensions value. Help?

To keyframe something that you are able to keyframe use RMB on the value and select insert a keyframe or with the mouse cursor over the value press shortcut I