Hello. I now. I've been asking lot of questions. But I wanted to now if there is a way to connect with mi band 4 in app inventor? 
How does the mi band 4 talk to the world? Bluetooth?
What data format / communication format is requried to access the data ?
Yes, its bluetooth.
But it's not just connecting to it, you can't access its data, it's super hard
I think you will need documentation from your device in order to have more information on how to access the data.
These can Help You But You Need an Extension Dev To Add it
Home · huamitech/rest-api Wiki (github.com)
小米健康云开放平台用户文档 (mi.com)
android - Official SDK/API for Mi and other smart Band - Stack Overflow
Thank you so much! 
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