How to store a custom DataAsset inside a variable?

I’m try to replicate the tire dust effect from the Vehicle Game example by using blueprints as much as I can. I had to use C++ to create a custom data asset class, called VehicleDustType, and that went fine. Now I’m having trouble setting a variable called Dust Type to the data asset. I’ve tried about every Variable Type there is, but I can’t find one that will give me the option to select my custom data asset. Here’s what I would like to happen (image taken from the Vehicle Game example):


Ever figure this one out?