A way to build applications that use the SAP HANA Database is through the Cloud platform available from SAP, called SAP Business Technology Platform (from now on called SAP BTP).
For trial purposes, a free account may be created at https://cockpit.hanatrial.ondemand.com/trial/.
To know how to create a HANA Database instance and use it in GeneXus follow sections 1 and 2 of this documentation: Deploy to SAP Cloud Foundry - SAP BTP