no, that is not possible so..but you can make an easy trick:
here if you have 3 attributes:

inventory_slot[3*number+item]=xxx;

so:
inventroy_slot[3*0+0]="Bug Juice";
inventroy_slot[3*0+1]=255;
inventroy_slot[3*0+2]=6;
inventroy_slot[3*1+0]="Soiled Diaper";
inventroy_slot[3*1+1]=9785;
etc...

btw: it starts by 0, but you can also start by one..makes no real different...