Link to topic in xda forum: https://forum.xda-developers.com/mi-6/themes/version-ofmiuicamera-mi-mix2-t3678415
New version of MIUICamera from Mi Mix2 is working on other Xiaomi devices (I have tested it on Mi6 and it's working so good). Supposedly is's working on Rn3(kenzo), Rn4(mido) too.
To use this app you must copy MiuiCamera.apk file to /system/priv-app/MiuiCamera, give it 644 permissions and reboot the phone.