Enable "Instances" metric for listVars in Workspace

We use listVars that expire on Visit. In Reports & Analytics, we can use "Instances" to measure when the variable was actually set. This metric isn't available in Workspace. As we want to use 100% Workspace in the future, it would be great to have the full functionality of the old reporting available in Workspace as well. So: Please give us Instances for listVars in Workspace. :-)