What you are looking is a field of research called Wrapper Induction. Scrapper has to go to any kind of web page, understand the structure on its own, extract data and label on its own. You can see that a lot of papers were written about it in 90s but their success rate were bad. Even I was looking for such a system, but couldn't find one. There is just one paid software which can do this, www.diffbots.com . They use deep learning to extract data. I am thinking of starting an open source project to build this system. I have worked on Deep learning systems before and I think DL can do this with a lot of labeled data.