Based on my prior knowledge, premature ventricular contractions (PVCs) are abnormal heartbeats that originate in the ventricles of the heart. These extra heartbeats can disrupt the normal electrical conduction of the heart and may be associated with various cardiac conditions.

To determine whether the myocardial infarction complications data of a patient shows chronic heart failure, we need to analyze the relationship between the feature "nr_02" (Premature ventricular contractions in the anamnesis) and the target variable.

Here is a dictionary that represents the relationship between the feature "nr_02" and the target variable "chronic heart failure":

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

In this analysis, we can observe that the feature "nr_02" only consists of two distinct categories: "no" and "yes", which directly correspond to the possible values of the target variable "chronic heart failure". Therefore, the presence of premature ventricular contractions (PVCs) in the anamnesis indicates chronic heart failure, while the absence of PVCs indicates no chronic heart failure.

Please note that if there were other possible values for the feature "nr_02" that are hard to predict, we would not include them in the dictionary. However, in this case, all possible values are accounted for.