How do you add an app as a data source for mindful minutes?

The iOS Health app has a Mindful Minutes feature that is supposed to get data from other apps, including Breathe and Headspace. There's a "data sources and access" section, with lists for apps allowed to read data, and data sources. On my Health app, both just say "none," and don't give any way to add any apps.

I Can't find any info on this anywhere, my quest for serenity is taking me through this extremely irritating bit of terrible usability! =:-0