How to add additional columns in workflow instances with AEM 6.5

Hi,

To add additional columns to the "workflow instances" in TouchUI, with AEM 6.5, which one is recommended to overlay from,

a. /libs/wcm OR

b. /libs/cq/workflow/admin/console/content/instances/jcr:content/views/list/columns?

As far as I can see the relevant nodes exist only under /libs/cq/workflow/admin/console/content/instances/jcr:content/views/list/columns, but, that section is greyed out (I suppose that means - Either Deprecated OR Internal to Adobe and so do not overlay this path).

If this correct, what is the path under /libs/wcm that I must look to overlay?

Thanks,

Nagaraju