How to Zero edges in World Machine for an imported terrain

In Vue when I import a terrain I have the option to click on Zero edges, this lowers all the edges of the terrain and helps integrate it in the environment. I want to skip this step and do it inside World Machine. Any idea how to zero edges of an imported terrain in World Machine?

Plug a “Radial gradient” generator into mask input of “file input”, the one that you use to import the original terrain. Use radial gradient to adjust the influence or shape of zero edge.