Does Cardiogram integrate with HealthKit?
Cardiogram accesses data from Apple Health and Google Fit and makes it more engaging and actionable to users. So Cardiogram reads data from (rather than writes to) Health / Fit. A workaround (if you'd really like to see data in Health) would be to download your Cardiogram data as a .csv file and upload it to Health. You can shorten this process by creating an Apple Shortcut.