Sync with Apple Health
Just like Google Fit, Apple Health will be an ideal choice for an additional sync provider.
Edit: Apple Health has some limitations like it doesn't expose an API that we can access to get the Health's data. Instead, we can use Healthkit to use it in any iOS device. So, to access the Health's data, we'll have to create an iOS app or somehow export the data from an iOS device using shortcuts or manually export the data to access it somewhere else. It really isn't feasible in that way.
Edited by Aman Kumar