Seafile Sync Client with local networking vs external network

I’m using the Seafile sync client (on Linux). I have an idea where in the settings, network tab, it would be great to have a local URL for syncing (identified by the WiFi network you’re on?) and an external URL (for when you’re not at home).

Immich does this for their client setup and it’s really slick.

I take it your router doesn’t support NAT loopback?