WSAPacman

Step 1: Download and install WSA Pacman

Step 2: Go to Windows Subsystem for Android → Developer and turn on Developer mode.

Warning:

You have to give WSAPacman, ADB Debugging permission.

Issues and Solutions

If the "Install" button is greyed out while installing apk

Solution: Open WSAPacman and turn on WSA from there.

If WSAPacman states that the "Installation timed out":

Solution: Wait for a few minutes, and see if the app is installed and shows in the Start Menu. If not retry the installation
In the case that nothing works, report this to the WSAPacman Github