Mutation testing for other tests than unit tests?

I have been reading up on Mutation Testing: the idea of a set of code, changing values in your code and re-running tests to see if you have code mutations on your hand.

Now, I am responsible for a large number of Functional Automation Tests; Regression and End-to-end. The more I read up on mutation testing, the more I see that it's mainly used for Unit Tests and not really anything else.

Is it also possible to apply Mutation testing to functional regression and end-to-end tests? Or perhaps even to Gherkin scripts?