Approval Rules: How to check if 2nd/3rd Line Manager exists?

Summary:

How to check if 2nd/3rd Line Manager exists?

Content (please ensure you mask any confidential information):

During the Approval process we need to Send FYI or get Approval from 2nd or 3rd Line Manager. In case the Employee is reporting directly to the CEO then there is no 2nd or 3rd Line Manager, so we need to add a condition to check that.

Are there any function gets the 2nd/3rd Line Manager ?

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

25C

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