Question about Zyxel NWA1123-AC, ac866/n300

A ZyXel USG60W firewall has an internal WLAN connection (for LAN access) and another simple WLAN router is connected to port 4 (for public access, only external, no access to the internal LAN with the shares). Now we would like to extend the range of these two networks as we have a meeting room on the 2nd floor (approx. 30-50 m) away. Is it possible to extend (repeat) two networks with this device above?

The question is somewhat unclear. But I would say yes, several virtual networks can be set up with configurable isolation between the individual SSIDs and, of course, their own access data.