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

Based on prior knowledge, the feature "n_r_ecg_p_02" represents the presence or absence of frequent premature atrial contractions on ECG at the time of admission to the hospital. 

Since the task is to determine whether there is chronic heart failure, it is difficult to directly infer the relationship between the feature "n_r_ecg_p_02" and the presence of chronic heart failure without additional information about other features.

The feature "n_r_ecg_p_02" could potentially be associated with chronic heart failure, as certain ECG abnormalities can be indicative of heart conditions. However, without further context or an understanding of the feature's relationship with chronic heart failure, it is not possible to make a definitive assessment.