Making an existing feature code (java) more scalable to allow external teams to easily introduce code changes independently

We are working on a feature coded by another team for a web application in java. We need to override the default logic when certain case is applicable. The partner team needs a way/ design that allows any external team like us to be able to modify the feature (if approved feature cr) with some config changes or bean creation and using when applicable to make the code more scalable. Is there a way to achieve the same?