There are currently no known plans to add export functionality to the RESTful API in the near future.
PS. If export capabilities are required, the new MilestoneSystems.VideoOS.Platform.SDK.Core SDK may provide a path forward. Although the SDK does not offer export functionality out of the box, it provides access to raw video streams, allowing you to retrieve video data and develop a custom export solution tailored to your needs.
See the announcement here.