Python/winrt support for python 3.8 version

[Larz60+]

it doesn't specifically say that it supports python 3.8 (shows latest as 3.7) and also states cpython requirement.
also under known issues:

This release of the Python/WinRT does not support WinRT composable types. This includes most of the classes in the Windows.UI.Composition and Windows.UI.Xaml namespaces. These namespaces are excluded from Python/WinRT.
Note, a few methods in other namespaces reference types in these namespaces. For example, MediaPlayerSurface is in the Windows.Media.Playback namespace but has properties that return types in the Windows.UI.Composition namespace. While these properties are available to Python, accessing them is not supported at this time.

I've had good success installing packages which specify 3.7 on 3.8, but this package might be a bit more fussy.
Best bet is to contact the authoe and ask. (Kenny Kerr Microsoft)