Based on prior knowledge, the feature "nr_08" represents whether the patient has had ventricular paroxysmal tachycardia in the anamnesis. To determine if this feature is related to the presence of chronic heart failure, we can analyze the relationship between the feature values and the target variable.

Here is a dictionary with the requested details:

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

In this case, the feature "nr_08" takes two categories: "no" and "yes". The values for the "no" target class are ["no"] and the values for the "yes" target class are ["yes"].

Please note that this analysis assumes that the feature "nr_08" is related to the presence of chronic heart failure. If there is limited prior knowledge or conflicting information, further investigation or statistical analysis may be required to accurately determine the relationship between the feature and the target variable.