Minimum: Make the fields non-final so that the settings can be configured via Groovy hook scripts
Nice2Have: Add support of proper UI AND allow configuring ArtifactManagerFactory via DataBoundSetters. It would allow using Configuration-as-Code plugin and other such tools
JENKINS-50571 - Make JCloudsArtifactManager fields non-final to allow configuration via System Groovy Hooks.
Ideally a better non-static configuration UI needed so that each run persists information about its artifact manager parameters. Otherwise reconfiguration will likely cause regressions.