I'm utilizing the /nodes endpoint in the Content Server Rest api. I can see that the api returns a columns object which represents the sortable columns (that contain a sort key). Is it possible to add to these columns? I attempted to create a new column directly in content server, but its not clear how (and if) this would filter down to the API. Mainly I would like to add the document's description as a sortable column if at all possible. How might one go about achieving this in the REST api?