We have no plans to mix analysis types, i.e. create an event frame within the rollup function. Therefore, you will need to use a Rollup analysis output as the trigger for a separate Event Frame analysis. Additionally, event frames by its very nature have a starttime and an endtime. What you described, even if we could do it, would have an event frame of zero duration as the Rollup analysis occurs at one single point in time. Can you describe your use case? Perhaps there's another way to accomplish your needs.
