How to use a custom MaterialPorperty in CZML?

CesiumJS
1

Hi, there:
I’m trying apply a custom MaterialProperty(see in circlePulseMaterialProperty.js） on EllipseGraphics.
it did work when I did like this:
image

here is the problem, how to use it in a czml file ? It seems czml “Material” properties has only 5 types(czml material), I tried in czml like this, it didn’t work:
image
it only works when I set 1 of 5 types. Can a custom MaterialProperty be applied in czml?