Based on prior knowledge, we need to analyze the relationship between the feature "n_r_ecg_p_02" (Frequent premature atrial contractions on ECG at the time of admission to the hospital) and the task of determining if the patient has chronic heart failure.

To do this, we will analyze the data and identify the possible values of the feature for each target class (yes and no).

Here's the dictionary with the relevant details:

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

Since the feature is categorical and specifically asks if there are frequent premature atrial contractions on ECG, the values will be either "yes" or "no". Therefore, the only possible value for each target class is "yes" for patients who show chronic heart failure and "no" for those who do not.

Let me know if I can help you with anything else.