How can I request an update to my Android app signing key?

I would like to request information on how to update my Android app signing SHA key. I am on the Essential subscription plan. My app is currently using an old SHA-1 signing key, and I have generated a new Google Play App Signing key. I would like to update the Android app signing key used for my app. Could you please let me know the process and what information you need from me to complete this update?