Yes, I have Ball's Complete Book Of Home Preserving (which is a terrible title, as the book contains no information about dehydrating, freeze drying, jerking or brewing, only water bath and pressure canning). It has a procedure for "berry" jelly where it lists half a dozen different kinds of berries and how to extract juice from them, to include elderberry, and then you use a quantity of said "berry" juice in a standard jelly recipe. Independent of this, I've found a beautyberry jelly recipe that resembles this procedure, so I feel okay canning it, and have done so for years now. I'm going to stop short of recommending it to anyone else. By all means, if you've got access to beautyberries, make the jelly, but can it at your own risk.