Wellcome Library is doing this with our material. See http://wellcomelibrary.org/item/b18035978 . In the markup there is a section of json-ld. Adding markup like this to our material was part of a "quick wins" linked data project from 2015-16.
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The Wellcome Trust is a global charitable foundation dedicated to improving health. We support bright minds in science, the humanities and the social sciences, as well as education, public engagement and the application of research to medicine.
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