After solving all problems, I finally was able to deploy the Streaming project from HANA studio to HXE Streaming server installed on Google cloud.
However, I cannot test using HANA studio running tool because of the following error:"Failed call to https://hxehost:60294/RPC2 (Failed to read server's response: Connection timed out: connect).
The project was deployed and running, confirmed by HANA cockpit access. Port 60294 was never documented anywhere and certainly not opened on Google cloud. What should be the approach in this case?