Based on my prior knowledge, there might be a relationship between a persistent form of atrial fibrillation in the anamnesis and chronic heart failure. It is possible that patients with a persistent form of atrial fibrillation in the anamnesis (nr_04 = 'yes') are more likely to have chronic heart failure.

Here's the dictionary based on this analysis:

```json
{
	"no": ["no"],
	"yes": ["yes"]
}
```

Note that in this case, there is only one possible value for each target class, so the dictionaries for both "no" and "yes" contain only one string.