Project group for Docker image

I’m trying to pack my project into Docker container using gradle-docker-plugin. And I faced with one question: as you know, gradle project has group, name and version, but Docker images use only name and version(tag). I want to save information about project group somewhere inside image attributes. Сan anybody knows the standard practice for such cases?

P.S. I can save this information inside labels, but maybe someone knows better place.