You want data in Fulcra that doesn't come from your phone: output from a script, readings from a service, a file you already have, or something an agent produced.
You can. Anything you can produce, you can write in, one value at a time or a file of many records. Files work too, which is the route to take for data locked in an account you'd rather not hand an agent the password for. You aren't limited to what Apple Health provides.
Apple Health is still the easiest on-ramp for health and fitness data, because anything that writes to Apple Health flows through to Fulcra without extra work on your part.
Full details are in the developer documentation:
If you have suggestions for other data sources, please let us know by either joining our discord server, and posting to #product-feedback, or sending us an email at [email protected].