Simple answer would be no.
Technically it is possible, but outside of the scope of C3 by itself. It also adds a layer of difficulty on top of the already complicated task of making a multiplayer game.
You CAN use the built in multiplayer plugin to match only local players, via a shared typed code or qr or whatever else system you want to design. The result would be essentially the same as a LAN only game, with the only difference that you have to be online to make the initial connection.