Based on prior knowledge, we can analyze the relationship between the feature "nr_01" and the task of determining whether the patient shows chronic heart failure (Yes or No).

Analysis of relationship:
- "nr_01" represents premature atrial contractions in the anamnesis.
- Premature atrial contractions (PACs) are extra contractions of the heart that start in the upper chambers (atria) and disrupt the normal electrical signaling pathway.
- While PACs themselves may not directly indicate chronic heart failure, they can be associated with underlying heart conditions that can lead to chronic heart failure.
- Therefore, the presence of "yes" for "nr_01" may have a higher likelihood of indicating chronic heart failure compared to "no".

Based on this analysis, we can create the dictionary:

```json
{
	"no": ["no"],
	"yes": ["yes"]
}
```
Please note that the possible values for "nr_01" are simply "no" and "yes".