Connected System key auto update

Hi,

We have created a connected system with Google Service Account as authentication. For every few months, the key rotation happens at GCP, then we fetch the service account key and update it on the connected system manually (upload key, authorize, and save changes).

To automate this process, we have the mechanism to fetch the service account key details from GCP using API schedular job, but we are unsure how to update it on the connected system without manual interaction on Appian designer.

So is there a way that we can do it from the server end or any other possible way to automate this key updation in a connected system?

Thanks,
Mahesh.