Creating a visibility animation

I am just getting started with Blender and thanks to the help of the great videos online I have been able to export a dts that works in TGE. I need to create a built in visibility animation for the shape, and couldn't find any tutorials on it. I know that this feature is new for the blender dts exporter so I understand the lack of information on it, but can someone please help me understand what I need set up in Blender to use this feature?