Based on prior knowledge, premature ventricular contractions (PVCs) are abnormal heartbeats that begin in the ventricles of the heart and disrupt its normal rhythm. Chronic heart failure (CHF) is a progressive condition in which the heart is unable to pump enough blood to meet the body's needs. PVCs can be a potential risk factor for developing CHF.

To analyze the relationship between the feature "nr_02" (Premature ventricular contractions in the anamnesis) and the task of determining if the patient shows chronic heart failure, we can examine the possible values of "nr_02" for both the "yes" and "no" target classes.

Here is the analysis:

- For the target class "no" (patients without chronic heart failure):
    - Possible values for "nr_02": ['no']
    
- For the target class "yes" (patients with chronic heart failure):
    - Possible values for "nr_02": ['no', 'yes']
    
Based on this analysis, we can create the dictionary as follows:

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

Please note that the dictionary only includes the possible values for each target class. In this case, the only value specified for patients without chronic heart failure is "no". However, for patients with chronic heart failure, both "no" and "yes" are possible values.