How to make changes to appConfig configurations using IaC - CDK ?

We are planning to build service using Lambda. We want to use app config based configurations for lambda. We would like to understand the process to update these config values. I see we can login into AWS console and make a change. Is that recommended ? I searched in AWS docs, couldn't find a way to change these variables via CDK - Iac way. Any leads on this will be super helpful ?