It's not certified for that type of operation, but theoretically it could...during descent on path, the flt control computer takes constant stabilized vector path updates. If you lost all rnav input, the vector would freeze in its last known stabilized state. There is some time limit to this, but no wind, it shouldn't matter. The flare is done off altitude. So theoretically it could auto land out of an rnav.

There may however be a lack of programming logic for that maneuver. The way an rnav or gps approach is set up to work in the aircraft logic is that (assuming you don't click off the autopilot at da minus 50) is to fly down the descent path down the centerline, level off at 50 ft agl and fly down the centerline of the runway.

IOW, don't try it.