The Sprint Health Gadget is for current, active sprints.
Past the Sprint Board - which shows estimates, etc - if you wanted this on a Dashboard you could add a simple Filter Results gadget to search for another sprint? This way you could show scope, estimates, etc - although you wouldn't get % changed or anything like that on it.
What is the specific use case you're looking to get out of showing the health of a future, not started sprint? Might be another alternative depending on the need :)
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