Just posted similar information in this thread
https://www.mobileread.com/forums/sho...215#post782215
Quick recap -- currently, there isn't a standard way to do it, though you can discover it for some apps.
There's also a more focused package manager (a.k.a android market) application being hatched at nookdevs, so please keep an eye out for that when it comes.
Best regards,
-kb