Can UMBREL on main network access a secondary network (Google Mesh) connected to the same router

As is the title - I have a google mesh network at home with all smart home devices connected to it.
My umbrel server is connected to the same router (from the ISP) that the google mesh hub is connected too. All of my smart home devices and other connections are via the google mesh network.
How can the UMBREL service route via the google mesh hub and register all devices (for the Home Assistant app for example).