How to add altitude for cluster layer or directly cluster itself

[mkrjhn]

Hi there. I have maptalks with drawn 3d polygons through three layer, and than only needs to add markers and clusters with altitude above them. I spent a week to understand how to add altitude for clusters, delved all sources for markercluster and maptalks, but anyway couldn't get it. Could you explain to me how to do that or point to a way?