Based on prior knowledge, it is possible that the presence or absence of paroxysms of atrial fibrillation at the time of admission to the intensive care unit or at a prehospital stage (MP_TP_POST) may have a relationship with chronic heart failure. To further analyze this relationship, we need to examine the distribution of MP_TP_POST values for each class of the target variable.

Here is the completed dictionary:

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

In this case, patients with chronic heart failure (target class yes) may have both "no" and "yes" values for the MP_TP_POST feature. However, patients without chronic heart failure (target class no) only have "no" as a possible value for the MP_TP_POST feature.

Please note that the dictionary represents the known relationship between the feature and the target based on the given information.