I meant from a single J-1772 port. From a charging station.
Do you mean you want to add chargers to an existing charge tank, using the same J-1772 inlet on the bike?
Technically, it is possible, but I am not sure about how mechanically possible. I have never seen the mechanics of the chargetank and how easy it will be to get in the connector cable. But with a 6KW charge tank, I probably wouldn't want to add chargers. Many ChargePoints can only handle 6.6 KW max, is one reason. But if the chargers use the J-1772 pilot signal to automatically lower all the chargers to be within the capacity of the charge station, then you can add as many as you want and all should be okay. So it depends on many things.
I do mine manually at each station, up to 8KW, sometimes I use two J-1772 adapters and two charge stations.
I have noticed I can go a little over the stated limit but not by a lot. A few hundred watts at the most and then a circuit breaker opens or whatever at the charge station. The newer Chargepoints will atomically reset themselves in around 30 seconds or so, IIRC. And will send you a message to your ChargePoint account that you have a charging problem.
-Don- Reno, NV