Smartthings WiFi Mesh Hubs across two Buildings?

I have unique situation (i think)
I have a house with an out building about 100’ away.
In the house I have a smartthings wifi. 1 connected to the modem and 1 expanding the mesh network. The out building, i have a hard line to the building. When i add the wifi unit to create the mesh network in the outbuilding, we loose connectivity.
Can i use the hardwire to plug in the wifi unit in the outbuilding and extend the mesh newtork in the building?
What is the best way to create the mesh netwrk in the outbuilding and surrounding area?