Get Volume Custom property using SDK

We are using SolarWids SDK to get Nodes, Volumes, Applications information. We need Custom property Values for one of the Custom property in orion. Below is the Query we are using, Do any one know how to get this information.

Custom Property Name is "Vol_Owner". We need one more column to show the values of "Vol_Owner" values along with other information in below query.

https://IP:17778/SolarWinds/InformationService/v3/Json/Query?query=SELECT+NODEID,+VolumeID,+Caption,+Type,+VolumeSize,+Vol_Owner+FROM+Orion.Volumes