Gilbert Quevauvilliers makes use of variable libraries in Microsoft Fabric:
In this blog post I’m going to show you how you can use variable libraries with connection strings as well as items.
This approach allows you to manage environment-specific configuration when deploying Fabric items across development, test, and production workspaces
If you’re looking to move your fabric capacities across workspaces or regions, you can do this quickly and easily without having to re-Plumb a lot of the work.
Click through for a working example.