```json
{
	"no": ["no"], 
	"yes": ["yes"]
}
```
Based on prior knowledge, the feature n_r_ecg_p_03, ventricular contractions on ECG at the time of admission to hospital, is a categorical variable with two possible values: "no" and "yes". In this case, we can directly determine that if the value is "yes", it indicates the presence of ventricular contractions on the ECG at the time of admission to the hospital, which is a positive sign. On the other hand, if the value is "no", it indicates the absence of ventricular contractions, which is a negative sign. Therefore, for the task of determining if the myocardial infarction complications data of this patient show chronic heart failure, the feature value of "yes" implies a chronic heart failure, while the feature value of "no" implies no chronic heart failure.