```json
{
  "no": ["no"],
  "yes": ["yes"]
}
```
Since the feature "NITR_S" represents the use of liquid nitrates in the ICU, it is difficult to predict based on this information alone whether the patient has chronic heart failure or not. However, we can infer that if the value of "NITR_S" is "yes", there is a possibility that the patient has chronic heart failure. On the other hand, if the value is "no", it suggests that the patient does not have chronic heart failure.