If you mean to manipulate item count, then yes:Sorry, but have any command for grow up seruns in inventory?
mc.inventory.serums_held[n][1], where 'n' is starting at '0' and representing the inventory slot.
e. g. mc.inventory.serums_held[0][1] for the first slot and mc.inventory.serums_held[1][1] for second slot.
Use this command to find your desired serum by count. After that manipulate the specific slot (lets say 'm') to the new value (lets say x):
mc.inventory.serums_held[m][1] = x