From what I understand, the necessary metadata is the open graph metadata (see, e.g., this question on Stack Overflow. I have not tested this, but according to its description, the semantic plugin should add the necessary metadata to the page. Have you tried this plugin already? According to the issues this plugin might also output some more information about the page's author than desired (e.g., its email), so better have a careful look at the data. The plugin does not seem to be very actively maintained but should be a good starting point.