Hi, I’ve checked with the developers, and unfortunately there’s no way to export the reviews. Rich Reviews was not built using any “typical” WordPress data structures, so there’s no way to use an export plugin or something and export the data.
With the right knowledge, you could do it via the database directly. But that’s far outside of anything we support. We do have some plans for this, but nothing we can give details on yet, and no timeline.
Sorry, I wish I had better news. But that’s the state of the plugin we adopted.