Is it possible to generate .watchface for apple watch, without iphone's default watch app or apple watch itself?

Question

I want to generate a .watchface file from my xcode project. Is there any way to create .watchface file from outside of the default Watch app?

I have found a website Facer, where they are offering customizing options and generating .watchface from their website. What approach they are following?

Answer 1

name.watchface -> name.zip Unzip it and make it into that structure Create watchface file programmatically and execute CLKWatchFaceLibrary().addWatchFace API