Hi,
aliexpress.com and zap.co.il have social tags, so it’s easier to get the main external image. Howerver, for amazon.com, it’s different. It has 37 images there. The plugin would need to read all the code and and look for a pattern. It would be a very slow process and the users would have a very bad experience.
So for now, I will say that’s not possible, but the idea is good, once some users have difficult to get the image address.
I have some ideas for the plugin and I think that in some months, integrating the plugin with an external service, it would be possible. I’ll keep this ticket open and I inform you if I have news.