I don't know of any recipe that would add the sugar to the puff pastry mix.
You usually add the sugar with any fruit filling, or before baking, like in Eccles Cakes, where the fruit is added, its then rolled out/shaped, then it is glazed, and sprinkled with sugar before baking.
I wouldn't add sugar to the puff pastry mix. I would only add sugar to a shortcrust pastry mix.