How to export Visibility animation controlled by a Set Driven Key from Maya?

Hi, in maya I have a rig whose blink is made by using several meshes at different stages of the blink. Each mesh will turn on and off according to a set driven key controlled by the angle of the eyelid joint. So if I rotate this joint down, the meshes will swap out with each other creating the illusion of a blink.

Other controls I have are set up in a similar way, but are keyed to other properties.

How do I export this from maya and get it working in Unity?

I looked up this tutorial:

, but he is putting the key directly on the geo in Maya which is not something I can do in my case.