https://zuul-ci.org/docs/zuul-jobs/ is a collection of roles and playbooks that do a lot of complicated things with nice abstractions such as this. Although they're designed to be called from the Zuul CI system, there's many good examples for anyone wanting to build out their Ansible in a scalable and maintainable way.
https://opendev.org/zuul/zuul-jobs/src/branch/master/roles/t... is a nice example of some pretty complex co-install of libraries for testing under tox (and you can unit test bits of it too...).
https://zuul-ci.org/docs/zuul-jobs/ is a collection of roles and playbooks that do a lot of complicated things with nice abstractions such as this. Although they're designed to be called from the Zuul CI system, there's many good examples for anyone wanting to build out their Ansible in a scalable and maintainable way.