Unfortunately, you can't. The best method is to use the Destiny Knot. Each time an egg is created, it will pick 5 of the 6 stats at random to pass from the parents to the egg (the 6th will always be random). Then, for each of the 5 stats, it will pick one of the parents at random, and copy down their IV for that stat to the egg.
That said, you can get 4 IV Dittos pretty easily, and sometimes even 5 IV Dittos, just by joining 5 star Ditto raids online (and 6 star raids whenever there is an event). This will greatly reduce the chances of a "garbage" IV passing down. When you eventually hatch offspring with better IVs than the Ditto, swap them accordingly.