Sorry, we don't know how to process InDesign file to extract thumbnails or previews for them either, we don't have such expertise, for Adobe Drive, it's a set of client components. it depends on the remote DAM service to provide such image data, if you DAM service doesn't have such ability, I think you can ask some help in InDesigh forum
Follow up to this question.
I just need to know if Drive will allow client side operations (interacting with the DOM object for CS Documents), or leveraging the InDesign application on the client side via Apple Script etc. Seems like the code is deployed as a WAR on the DAM server, so I wasn't sure if any client side operation is possible.