How to modify HTTP URI using ILX Plugin (v13+)

I am trying to implement ILX Plugin for modifying certain HTTP parameters before forwarding the request to the server. I am able to modify the headers using setHeaders. However, I am unable to find a method to modify the URI.

eg.

/a/b/c?p=np (Transform to) /catch-all?p=np

Is there a method I can use to modify the URI ?