Hi Scott,
Currently on the Trial landscape, HANA XS is a bit... complicated... to access.
As outlined in this blog How to consume a HANA XS service on the HANA Trial landscape HANA XS requires not only HANA Cloud Connector, but also a Proxy app to connect to via HCP.
Unfortunately this is compounded by the fact that currently SAP API Management on HCP cannot directly consume HANA Cloud Connector destinations, and so there is an additional step after running through the above Blog, SAP API Management – Using Cloud Connector (fortunately the WebIDE creation portion of Blog #1 is a good walk-through to set you up to follow blog #2).
I have tested this setup myself just now, and it works, although it is some work to enable.
I hope this helps with your question!
Regards,
Elijah