Find Pending Approvals for Inactive Users

[Mathew Lederman]

Does anyone have a JQL query I can use to find pending approvals for inactive users? 

I tried some combination of the two below queries but I couldn't get anything to work.

assignee not in membersOf("jira-software-users")

pendingBy() 

[Brie Taylor]

Where the inactive user is the assignee:

 assignee in inactiveUsers() and approvals = pending()

Where the inactive user is the reporter:

reporter in inactiveUsers() and approvals = pending()

If you're after a query where the approver is inactive you'll need to enable the search functionality against the field first