Different code per page (re schema.org metadata)

With Google pushing for having schema.org metadata embedded in the header (e.g. as JSON-LD script) it is essential to be able to define some common code to be inserted in the header across the site (which can be easily done with your plugin), but you also want to be able to overwrite this common code with specific code per some posts/pages if needed. Can you do this with this plugin? If not it is an important feature to support.