*This will replace you're current wallpapers with OP 8 wallpapers.
Install BOTH apk's and reboot.
If you want to go back to stock wallpapers you have to down grade to the older version of wallpaper.apk again and then install your choice of wallpaperresource.apk
Thanks to @Red_Acid for pointing this out.
Xiaomi Miui 12 superwallpaper's :
Xiaomi Miui 12 superwallpapers Original post by XDA: