Customizing Perception camera labeler

I am using the Perception package in Unity to create synthetic dataset for levees. And have used the package before to create other datasets. But now I need to create a semantic segmentation labeler to automatically label levees.

My scene has a terrain asset that I have modified with the set height tool to resemble a levee. I was thinking of labeling all the parts of the terrain above a certain height as a levee. But I don’t know how I’d customize the current labeler to do it. Here is a screen shot of the scene I’m working on.

I’d highly appreciate any help regarding this or any other way to label this.

Thank you.