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

Based on the given feature "nr_01", which describes the occurrence of premature atrial contractions in the patient's medical history, we can analyze its relationship with the presence of chronic heart failure as a myocardial infarction complication.

Since the feature "nr_01" only has two categories: "no" and "yes," we can conclude that the presence of premature atrial contractions in the anamnesis does not provide enough information to determine if the patient has chronic heart failure.