Through REST alone, that is all you can extract at this time. The REST APIs are being worked on for future releases where expanded capability like that may exist - I would advise if it is important to you (or even just seems like a good suggestion) that an Idea is raised with these details so that it can get on the radar of the product owners.
Otherwise as things stand, it would take an additional SOAP request (e.g. XOG) to get this supplemental data when needed.