With adjuncts as they are called. The fruit has sugar, simple sugar so the yeast devours the flavor if added during fermentation.
So either a flavoring sold at your Brew store or online. Chocolate we use Nibs opposed to any Chocolate that had a sugar in it. (looks like bark) I am adding Grapefruit to an IPA, where I skinned the fruit, removed the white pith and dried in my drier, you can also buy this as an adjunct. However adding a Grapefruits Juice would be futile due to the juice is sugar and the yeast devouring or re awakening to late pitch it. Another avenue is trying to source a Hop that has overtones that you are looking for, but Blueberry is a tough onE, there are Passion Fruits. Best to add at pour time if you want an adjunct like that, Create a Blueberry Syrup concentrate, pout in Pint glass before pouring beer.