Expose more Greenworks Steam cloud APIs to NW.Js and Electron (1.11.0: Supports Greenworks v0.18.0 for NW.Js v0.92.0, Steamworks SDK 1.60).
It's not exposed in this addon.
I also don't see it in the underlying greenworks library (which you could access through scripting.) You can see more here: github.com/greenheartgames/greenworks/blob/master/docs/friends.md
Thank you!