Getting Project Settings-Task Default Custom Forms to show on a report

[CBuckwal]

I've been unsuccessfully trying to get Project Settings-Task Default Custom Forms to show on a report. It seems like it should be possible on a project report, but I can't get the correct text mode. Default Task Approval in Project Settings is selectable as a column without text mode. From looking at the Default Task Approval text mode (shown here), I found object categories in TaskDef collections and thought that may be default task custom forms. 

displayname=Default Task Approval

linkedname=taskDef

namekey=view.relatedcolumn

namekeyargkey.0=taskDef

namekeyargkey.1=defaultApprovalProcessID

querysort=taskDef:defaultApprovalProcessID

valuefield=taskDef:defaultApprovalProcessID

valueformat=HTML

I tried the combinations below without success, using string and list in list method. All my text mode attempts come up blank.

displayname=Default Task Categories

listdelimiter=<p>

listmethod=nested(objectCategories).string(name)

textmode=true

type=iterate

valueexpression={categoryID}

valueformat=HTML

displayname=Default Task Categories

listdelimiter=<p>

listmethod=nested(objectCategories).string(name)

textmode=true

type=iterate

valueexpression={taskDef}.{categoryID}

valueformat=HTML

Thanks for any suggestions here. 

Cathy

[KellieGWAB]

I'm able to pull in the custom form IDs with this code:

valuefield=taskDef:objectCategories
linkedname=taskDef
valueformat=HTML
namekey=view.relatedcolumn
namekeyargkey.0=taskDef
namekeyargkey.1=objectCategories
querysort=taskDef:objectCategories