For cluster tables HVR will still perform log-based CDC like it does for transparent tables. With that HVR picks up the encoded data in its binary format. The SAPXForm will then, upon integrating the changes, decode the data into the definition that the SAP application uses. To enable this you must pick up the cluster table definition from the SAP dictionaries during table explore.
A quikstart for the definition of SAPXForm is in our documentation: https://www.hvr-software.com/docs/quick-start-guides/quick-start-for-hvr-sapxform
Please do note that SAPXForm is separately licensed (and requires a separate license to be enabled).