We also got this question lately. What can we tell our users? Is it a feature that we may expect in future releases? Because I can imagine that place owners exceptionally want to reach to this group too.
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The way we came up with was a simple script using the Jive REST API to return a list (an array, actually) of the followers in a Group. We did this as a way to "transfer" followers from one place to another, so we didn't implement a downloadable (or even human readable) version, but that would be easy to implement once you have the actual list.
fwiw, this old blog post by Timothy Hales lists some group maintenance tasks including creating a list of all members. https://community.jivesoftware.com/community/developer/blog/2014/11/04/community-management-using-python-and-the-rest-api