Based on prior knowledge, premature ventricular contractions (PVCs) are abnormal heartbeats that originate in the ventricles of the heart. Myocardial infarction (heart attack) can sometimes lead to the development of PVCs. Chronic heart failure (CHF) is a condition in which the heart is unable to pump blood effectively.

To analyze the relationship between the feature "nr_02" (Premature ventricular contractions in the anamnesis) and the presence of chronic heart failure, we need to look at the data and check whether patients with a history of PVCs also have a higher chance of showing chronic heart failure.

With this analysis in mind, we can create the dictionary:

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

Here, the categorical values "no" and "yes" represent the presence or absence of premature ventricular contractions. Since the feature is categorical and has only two possible values, we can conclude that if the patient has a history of PVCs (nr_02: "yes"), there is a possibility that they may show chronic heart failure. Conversely, if the patient does not have a history of PVCs (nr_02: "no"), they are less likely to show chronic heart failure.

Note that it is not necessary to specify any other values for nr_02, as per the task requirements.