Download Huawei Health App on Appstore
Open the app, log in with your account and go to profile
Add a Device under profile
Enable data syncing (profile -> settings -> data sharing)
Select Apple Health
Download Huawei Health App on playstore
Download Huawei Health App on playstore
Open the app and click on the "Me" tab on the bottom right. Then click on "Settings"
Click on "Data Sharing"
Select Google fit.
Link it and you're done!