Based on prior knowledge, premature ventricular contractions (PVCs) are abnormal heartbeats that begin in the ventricles. While PVCs can be common and benign, they can also be a sign of an underlying heart condition, such as chronic heart failure.

To analyze the relationship between the feature "nr_02" (Premature ventricular contractions in the anamnesis) and the task of determining if the patient has chronic heart failure, we need to examine the distribution of the feature values for each target class (yes and no).

Here's the dictionary analysis for the given feature:

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

Please note that in this case, the feature values "no" and "yes" exist in both target classes. Since it is not specified whether any other values apart from "no" and "yes" exist for the feature "nr_02", we assume these two values cover all possibilities for the analysis.