If its an addition to the kibbled foods, then I wouldn't worry about it. The nutrition in the bones is already in the kibbled food. Especially if its a holistic type of food. You might want to try and find a nutritionist to determine the dos and donts as far as adding chicken bones. I typed in "pet nutrition" in google and got a couple in my area. It'd be worth a shot, especially with an older dog.
I know the raw diet uses raw chicken bones in the recipies so I would assume you should crush the raw bones instead of cooking then crushing them.