```json
{
	"no": ["no"],  
	"yes": ["yes"]  
}
```
Based on the feature description and the task, it appears that the feature "nr_01" is related to the occurrence of myocardial infarction complications. The feature represents the presence or absence of premature atrial contractions in the patient's anamnesis. 

In this case, the value "yes" for the feature "nr_01" indicates the presence of premature atrial contractions in the anamnesis, while the value "no" indicates the absence of premature atrial contractions. 

To determine whether the patient shows chronic heart failure, we need to analyze the relationship between the feature "nr_01" and the presence or absence of chronic heart failure in the patient's myocardial infarction complications data. Since the relationship between the feature and target variable is not explicitly mentioned, further analysis is required to ascertain this relationship.