Wall Plug -> HA -> Harmony Hub -> Harmony Remote

I have a Fibaro Z-wave Wall plug. I had it connected to my SmartThings Hub v2. And through that I controlled the wall plug from my Harmony Ultimate remote, with hub.

But then I bought my Raspberry PI 3 B+ and installed Hassbian with Home Assistant on it. And then a Z-wave stick. And now I want that to be my new hub. I wanna get rid of the SmartThings hub.

So question is, how do I add the Raspberry hub, with the connected wall plug, to the Harmony Hub?