Based on prior knowledge, ventricular paroxysmal tachycardia in the anamnesis (feature nr_08) can be a potential risk factor for chronic heart failure. Therefore, there is a possibility that the presence of ventricular paroxysmal tachycardia in the patient's medical history may indicate chronic heart failure.

To analyze the relationship between feature nr_08 and the presence of chronic heart failure, we can examine the distribution of nr_08 values for each target class (yes and no). Here is the generated dictionary:

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

Explanation:
- For patients without chronic heart failure (target class: no), the only possible value for feature nr_08 is "no".
- For patients with chronic heart failure (target class: yes), the possible values for feature nr_08 are both "no" and "yes".

Please note that this analysis assumes that the only possible values for feature nr_08 are "no" and "yes". If there are additional values or missing values, they should be considered separately.