Need to be able to create Channel-based Teams meetings / or at least be able to link Graph-created regular Teams meetings with a Channel's calendar. Unfortunately, neither of these scenarios are possible through the Graph API. Channel calendaring is currently only a feature available to Teams as a client and has no publicly available APIs to integrate with it.
What is needed is a way to write/update the JoinURL of the Channel Calendar. The teams client does this but there is no API to do this using Graph API.