Hello! I would rehydrate the berries then freeze them to break down the cell walls to more easily extract the juices.
I do not have knowledge on the amount to add, but there are plenty of melomel(mead with fruit) recipes floating around!
As far as whether they should be added in primary or secondary, thats up to you. If added in secondary they should add a bit more flavor, as fermentation is said to carry off some flavors as it bubbles away.
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