With .NET 6 Preview 6 released on Jul 14, 2021, and now Preview 7 released on Aug 10, 2021, .NET MAUI progressed a lot with Workloads, Gestures, Clipping, Alerts, New Layouts, and mainly first-class support for Visual Studio 2022 (with Preview 3.x). But, there is a catch in here. NO item templates for Visual Studio for now :-(.
Update: This extension is now updated to support .NET MAUI Preview 10 with VS2022 Preview (17.1.0 Preview 1.0) IDE and .NET MAUI (Preview) Mobile Development workload installed. This can be downloaded and installed from the same link mentioned in this article.
Update: A more advanced all-in-one .NET MAUI App project template is now available to install. Check out this article for more details.