Based on domain knowledge, we can analyze the relationship between the feature "nr_04" and the presence of chronic heart failure in myocardial infarction complications.

If a patient has a persistent form of atrial fibrillation (nr_04 = "yes"), it is more likely for them to show chronic heart failure. Conversely, if a patient does not have a persistent form of atrial fibrillation (nr_04 = "no"), it is less likely for them to show chronic heart failure.

Based on this analysis, we can generate the dictionary:

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

Since the feature "nr_04" is a categorical variable, we include the possible values for each target class. In this case, the feature can only take two values: "no" and "yes".