Thank you Ning , I was able to export roles from HANA using the following procedure
Create a Delivery Unit on HANA Lifecycle Management
Create a Package on HANA and assign it to the relevant Delivery Unit created earlier
Create a Role on HANA as a repository role from SAP HANA Web-based Development Workbench under the package created earlier
Approve and Release the Transport from CTS+
Import the role on the relevant landscape .