I don't see how that improves security at all, though. Even if you encrypt values on the client, the client can still see them before they get encrypted. So you are not hiding anything from the client.
Once the request goes over the network using HTTPS, then everything is encrypted. Usually the main concern is: can someone else on the network intercept and read the traffic? With HTTPS the answer is no. Adding extra encryption to the URL or request data does not affect that answer.