Comment 1 for bug 1714926

Thank you for your bug report.

In the long term I believe some modeling from the Juju side is required to solve this properly.

Support for cross-model (and indeed cross-controller) relationships is under development and indeed available for testing if you live on the bleeding edge. Have a look here: https://insights.ubuntu.com/2017/07/20/testing-the-future-of-juju-with-snaps/

As some time will pass before this feature is readily available in stable environments and charms pick up support, could you share your sense of need and urgency for an eventual interim solution through charm configuration?