How can we define skip level rules for vacant position when using position hierarchy in approvals?

Summary:

Client has position hierarchy defined but some positions are vacant. They are using it for offer approval.We want to define the rule tp skip level if a position is vacant in teh hierarchy. How can we achieve this?

Content (required):

Defining Skip rules for approvals when approving offer letter.

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

22A

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