Stock Nav Unit bluetooth question..

[Mark05Z71]

I recently purchased a 05 Z71 Hoe with onstar, built in nav (stock unit) and bose sound system. Ive been beating around the forum when I have time but haven't found what im looking for.

Is there a way to add bluetooth capability to onstar or the stock head unit?

Please dont bash me if this question has been answered multiple times, I am new to the forum. Any input would be greatly appreciated.

Thanks Mark