Unfortunately, you can't do either in the out-of-the-box worklist control. The only columns you can add are the ones listed in the "Available Columns" list.

Hi ,

I try to extend my worklist like this example :

http://flowfactory.fr/blog/en/2020/03/03/creating-a-custom-worklist-using-k2-rest-api/#comment-11481

but the issue in the last step when create list view (GetTasks) method not appear.

Please make sure that the SmartObject method type is of List, instead of Read or Execute for example, as the data source for a list view will expect list method: