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Unfortunately, you are correct. This type of behavior is not available in the Jive Cloud environment, and I haven't heard any rumblings of the product even considering this level of "interception".
One consideration would be to create a wrapper for Jive content that uses the APIs to pull and render content. At this point, you would have access to cookies, content and could use whatever technologies you'd like implement the wrapper. Albeit, its not the same pattern, but it work with Cloud. Hope that helps.