Full screen data fields with several sub-fields

So far I thought a datafield app is about one field, with one simple value calculated by implementing a ~WatchUi.SimpleField class's compute method.
It is relatively simple, I have developed some, and there is one of mine already in the Garmin app store.

Now I see a great app like this:
https://apps.garmin.com/en-US/apps/6531e1a1-eede-419e-ac39-4a5093b371e8

Its app type is datafield, but it contains 7 different datafields.

Is this some kind of a 'hack', or there is a straightforward way to implement such a project?
I could not find anything about it in the documentation and neither a sample project. (it can be my fault, I have just started to develop things for this platform)

Thanks very much!

And thank you for your notice, I have found earlier version of SDK now with time machine, so I have found the sample.