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

Based on the feature description and the task, it seems that the presence or absence of paroxysms of supraventricular tachycardia on the ECG at the time of admission to the hospital (n_r_ecg_p_08) can be used to determine whether the patient has chronic heart failure. 

The feature n_r_ecg_p_08 is a categorical variable with two possible values: "no" and "yes". 

In the case that the target class is "no" (indicating no chronic heart failure), the only possible value for n_r_ecg_p_08 is "no". 

In the case that the target class is "yes" (indicating chronic heart failure), the only possible value for n_r_ecg_p_08 is "yes".

Please note that there are no other possible values mentioned in the feature description, so the lists in the dictionary only contain the values that are relevant to the target class.