WSA, or Windows Subsystem for Android, is Microsoft's VM implementation to run Android apps on a Windows 11 PC.
Currently only a handful of countries are supported by it.
But even if you are in a supported region you might not like being limited to Amazon Appstore.
This is how you get around it.
Source: https://github.com/LSPosed/MagiskOnWSALocal
This guide is confirmed to work at the time of writing. Microsoft keeps changing things, this might break in the future.
Please read the documentation of linked script if that happens.