Is it possible to use the delegation functionality for invoice approvals?

Summary:

We have a business need to set up a delegate approver to approve invoices that are routed to a specific individual using the Invoice Workflow Rules Spreadsheet.

Content (please ensure you mask any confidential information):

Under Account Management > Approver Delegations > Category, I do not see an option to assign a delegate to approve invoices.

Delegates to approve invoices are not the same delegates we assign to manage Expense Reports. How are we able to achieve setting up delegates to approve invoices and separately, set up delegates to manage Expense Reports?

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