Custom Description field in HR Help Desk not listed in Action Plan Action attributes

Summary:

I have created a custom description field in Application Composer for the HR Help Desk.

When I attempt to configure it into the Action Plan Action settings its not listed under the Attributes?

I would have used the standard description field but you can't amend the character limit. The custom description field needs to carried across to the new case when escalating the request to a case. Please can you advise the best way to configure this?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):