LandScape node seems to be invalid in Material Layers

I’d like to use Material Layers for my landscape material but I still couldn’t find the corresponding layer in landscape after I connected node “LandScape Layer Sample” in Material Layer or Material Layer Blend. Unless I set the default Material Layers in the “Material Attribute Layers” node in the material.

I think the Material Layer is very convenient, so I want to use it in LandScape. How should I modify it?

Material Layers is not supported for Landscape
I’ve been asking in the Material Layers feedback thread but so far I’ve gotten no answer

Material layer has been released in UE4.26. It seems that they have forgotten this requirement.