Based on my prior knowledge, paroxysms of atrial fibrillation in the anamnesis (feature nr_03) can be related to the development of chronic heart failure. Atrial fibrillation is a known risk factor for the development of heart failure, as it can lead to impaired cardiac function and increased strain on the heart.

To analyze the relationship between feature nr_03 and the presence of chronic heart failure, we need to examine the data. We will look at the possible values of nr_03 for each class of the target variable (chronic heart failure) to determine if there is any pattern.

Based on the given feature description, the possible values of nr_03 are 'no' and 'yes'. Now, let's analyze the relationship between nr_03 and chronic heart failure:

For the target class 'no' (no chronic heart failure):

- There may be individuals with no paroxysms of atrial fibrillation in their medical history, indicating that they have not experienced this condition in the past.

For the target class 'yes' (chronic heart failure):

- Individuals with chronic heart failure may have experienced paroxysms of atrial fibrillation in their medical history, indicating a possible relationship between the two.

Based on this analysis, we can create the dictionary with the following format:

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

This dictionary indicates that for individuals without chronic heart failure, the only possible value of nr_03 is 'no'. However, for individuals with chronic heart failure, both 'no' and 'yes' are possible values of nr_03.

Please note that this analysis is based on general knowledge and assumptions. To derive more accurate and specific conclusions, it is important to consider additional data and conduct further research.