In that case you would follow the taxiways using an airport map, and don't ask for a FollowMe.
Right now, GSX can't do that, and having an additional interface to select taxiways might be cumbersome and, nothing can guarantee the taxiways the ATC (especially a live controller) will assign to you, will be considered valid by GSX, it would be enough the controller had a map with some layout, and the AFCAD of the scenery was either outdated or too new and if taxiways changed, it would create a mess of misunderstandings.