We’ve release a version of Workflow reporting a few months ago and are trying to figure out where we are going with this.
Please tell us what you would like us to add to this feature.
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We've had a few comments concerning what fields are visible in the workflow report (especially the associated list and content type)
This limitation is actually due to the fact that the workflow report is an aggregation of site and list workflows. Since site workflows don't have an associated list and content type, we can't display that information.
You can actually build a custom report to do what you want to do. Simply go to "All reports" and then select "create custom report". From the drop down list, select "List workflow" as the object type. The two columns you want will actually be added by default, but you could also add other columns you are interested in.
We'll take note and see how we can improve this experience if we decide to modify it in the near future.