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

Based on the description of the feature "MP_TP_POST" and the task of determining if the patient shows chronic heart failure, it seems that the feature is related to the task. Since the feature represents whether the patient had paroxysms of atrial fibrillation at the time of admission or prehospital stage, it is possible that patients who had these paroxysms could be more likely to have chronic heart failure. Therefore, the value "yes" in the "MP_TP_POST" feature could indicate a higher probability of chronic heart failure. However, without more detailed information or domain knowledge, it is difficult to accurately predict the relationship between this feature and the target variable.