Create ASP.NET WebForm .NET 6 VS 2022 based ASPX pages not razor

You can't.

ASPX is from the WebForms (System.Web) part of the .NET Framework. This area was not ported to .NET Core, or to newer versions of .NET (5+), and there are no plans to do so.

For a component-based web development framework, Blazor is the new Microsoft platform. There is a migration guide here which can serve as a starting point, but migrating will be an involved process.

There is no way you can create WebForm project (with .aspx) in .NET 6. You can use VS 2022 to create a WebForm project if you install .NET Framework 4.8.