Alternate wifi (different LAN)

Hi,

My hass.io (rpi) is connected through the ethernet port, autodetecting the devices that are available in the same LAN wifi network (this is what I understand). It connects through the Ethernet port to my ISP router that also has a wifi network available.

Connected to the ISP router I also have a google wifi mesh network but it won’t autodetect the devices in that mesh network.

Is there a way to change this so it auto-detects the devices in the google wifi mesh?

Thanks!