On Task Type reports, there is a new field in the Task Details section called CHECKLIST ITEMS. It’s field description reads “the number of Checklist Items associated with the Task”
There's another available field called OVERDUE CHECKLIST ITEMS. This will display the number of overdue checklist items associated with each task.
When a task is added to any report, you’ll have the ability to choose “checklist items” in the drill down link.
When a report is run with the drill down link and you click on the link from the report, a new tab will open up to the CHECKLIST ITEMS subtab, located under the TASKS tab in a project dashboard.
NOTE: You’ll need to manually select the task item to view the checklist item.