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A REST query like http://localhost:8080/pressgang-ccms/rest/1/topics/get/json/query;minHash=1234%3A0.6?expand=%7B%22branches%22%3A%5B%7B%22trunk%22%3A%22topics%22%7D%5D%7D should return topics with an expanded field like "percentSimilar". This would reflect how similar the content of the returned topics is to the source topic (1234 in this example).
This should probably have it's own REST endpoint, as that is outside of the normal topic model.