Here is a way might help
1. Download the watchface from this page, it is a bin file
2. Download "Notify for Xiaomi" from Play Store
3. Open the app and follow the guide to connect your device (You should uninstall "Mi Fitness" or turn it off temporarily if you installed it)
4. After you connect the device successfully, click "Device" -> click "Update watchface" -> choose the bin file you downloaded -> click "Install"