Integration with Samsung Health would be great. I use it as a central repository for my health data. It brings in step,sleep, and other vitals from my Samsung Watch and Oura Ring. Would not be practical to manually enter all the data points into Diarium. Since the data is already present, having the option to bring it in like it does the google calendar and the fit app would be great.
Alternatively bringing in data from the Oura Ring App would be even more comprehensive as it tracks a lot more data points.