Copying a dashboard and its elasticube /datasets from one sisense server to another via rest api

Hi, I am trying to export and import  dashboards and their elasticubes and datasets from one sisense server to another via sisense rest api but I can't seem to find anything to help me with this. I have tried to use data model api (/api/v2/datamodel-exports/stream/full?datamodelId=id) to export the elasticubes but when downloaded, it appears to be empty so I am unable to import it. Any help to achieve this will be greatly appreciated.