If you want people to buy your stuff, tell them in clear words what they are buying. Not copy-paste the item description and lose all formatting in the process. I’m not buying a wall of text that’s hard to read.
It’s already implemented as one would expect it as an in-game item:
Why do I need to go out of the store to find details on what I’m about to buy?
Why can’t I have these details in the NES directly?
On every good shop on the web you have a tab or section with the details of the item you buy. If I don’t find that, I’m hesitant to buy - it might be the wrong thing, I can’t be sure.