Welcome to the new forum! We upgraded our forum software with a host of new boards, capabilities and features. It is also more secure. Jump in and join the conversation!
You can learn more about the upgrade and new features here.
By "nutritional values", do your mean like vitamins and minerals? If so, why are you thinking this information would affect the OG and ultimately the ABV? Or, are you referring to the sugar, extract potential and yield? If so, much of that answer would depend on the apple juice itself. Much like malt, the possibilities are many.
If you are looking to add fermenable sugar value to the profile, then you need to create the profile in the fermentables (grain) ingredients listing. In most cases, juices end up being more of a diluent to the concentration of fermentable sugars in the wort than adding to the specific gravity.