Using Workflow Variables in ACM Coverage File Filters

I am working with RSA Access Certification Manager (ACM) and reviewing the Coverage File documentation.

The documentation explains that reviewer, subject, and object filters can use database attributes and custom attributes (for example,

DEPARTMENT, CAS1, CAS2, etc.) as filter criteria. However, I could not find any information regarding the use of workflow variables within coverage file entries.

Has anyone successfully used workflow variables in a coverage file filter, for example:

DEPARTMENT='${DepartmentVariable}'