Next to the classic projects you can also choose next-gen projects in Jira Cloud. Synchronizing with next-gen projects is possible with Backbone, and configuring the synchronization works as with any other project. You can synchronize a project on server to next-gen and also synchronize with different types of projects (e.g. service projects, software projects).
There are, however, a few features that do not yet work:
If you run into any other issue with synchronizing next-gen projects, or have other questions, then please contact our support.