fortunately i was able to generate one for mia1. now we can root this device without any recovery.
1. unlocked boot loader.
2. this Zip
3.adb debugging should be enabled
How to -
1. put your phone in fastboot mode by volume down + power key.
2. connect to pc, ( make sure adb debugging is enabled)
2. extract above zip anywhere in your desktop and run root.bat file.
wait for some time, when it boots up you should have root access . although you won't see any su app. tried with solid explorer and was able to edit build.prop. without any issues. enjoy