CMDB Health Remediation Task Days in WIP Metric

Hello,

My team uses the WIP state on CMDB Health Tasks for when an INC, Story, or Decom is related to a task. We would like to be able to report on the number of days a task has been in the WIP state. What are the best practices for tracking this metric? Is there a way to do so without creating a custom field?

Thank you,

Adam