Just as idea…
I use the charge state as trigger.
If connected and cable type is IEC (AC charging), then use a higher interval.
If disconnected, use standard interval.
I have to check what cable type is shown for SuC charging. If anyone is at a SuC next time, please share the cable type 
My target is to set a data saving interval while AC charging while at a SuC the standard interval should be used instead.
