Adding vanilla beans to a bottle of stout

I'm wondering how to add vanilla bean or coffee to a stout (like bcbs) out of the bottle to add some flavor. I looked around the site and google but couldn't find a thread for doing this (besides when you are brewing the beer). Anyone that can point me to the appropriate thread I would greatly appreciate it. Or if you know of the proper way to add vanilla bean, coffee, and coconut.

 

thank you