The way you enable mock location on Android is fairly simple:

Mock Location is available in the “hidden” Developer Mode menu on your device:

Go to your “Settings”, “Systems”, “About Device” and tap multiple times on “Build number” and activate the Developer Mode.

A new “Developer Options” menu will be available under “Settings” / “Systems

In the “Developer Options” menu, scroll down to “Debugging” and activate the “Allow mock locations”.