Routing performance documents for approval based on Rating

Summary:

Is it possible to route performance document for approval based on rating provided

Content (required): Customer would like to route to approval if rating is "x" and for self approval if rating is not "x". Which attributes would be capturing rating and what would this be written as?

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

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