do I need to write a plugin for that ?

You need to write a plugin. Pants does this for its own jvm artifacts, although we don't include the org as part of our plugin. + The plugin https://github.com/pantsbuild/pants/blob/master/pants-plugins/src/python/internal_backend/repositories/ register.py + The registration of the plugin: https://github.com/pantsbuild/pants/blob/master/pants.ini#L43 https://github.com/pantsbuild/pants/blob/master/pants.ini#L49 + Use of the plugin: https://github.com/pantsbuild/pants/blob/3c1b31529625cbd969bfbb8510ede4d24b6e5fb9/src/java/org/pantsbuild/junit/annotations/BUILD#L8

thank you very much !