NNNNNNNNNNNNNNNNNNNNNNNNNNoooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooo!
No, you can't.
Well you can but it would be meaningless and incorrect. After all you can write in your logbook whatever you like.
Some people log these sort of flights in another logbook or use some pages from the back. Some folks mark their 'capacity' as SNY (supernummary) but that is just as meaningless as 'P2' or whatever.
Main thing though: Did you enjoy it?