This is how Samsung had to handle its own complications in the Weather app. SHORT_TEXT, LONG_TEXT, RANGED_VALUE
Custom complications included:
1.Feels like
2. Weather
3. Weather (Hi/Lo)
4. Wind
5. Air Quality
6. Beaufort
7. Chance of Rain
8. Humidity
9. UV Index
These all are available in Simple Weather app from Simple App Projects.
Play Store Link - https://play.google.com/store/apps/details?id=com.thewizrd.simpleweather
App is available as freemium.
I came across this application only recently and asked the developer to add new complications. This is the result
