At the moment, it is not possible to configure Add-on logging. If I want to log something from the extension, I must manually configure logback.xml for these classes (namespaces/packages), for example in the deployer storage extension addon.
My idea is to enable,e for example logging configurations (either via .json configuration) in the addon itself, or to be able to create CDMergeableConfigurationExtension to merge my custom logback.xml configuration with the default one.
For example something like this: