Based on prior knowledge, myocardial infarction is a condition where the blood flow to the heart is blocked, leading to tissue damage. Chronic heart failure, on the other hand, refers to a progressive condition where the heart is unable to pump blood effectively.

Analyzing the relationship between the feature "n_r_ecg_p_03" (ventricular contractions on ECG at the time of admission to the hospital) and the task of determining chronic heart failure:

1. We can assume that the presence or absence of ventricular contractions on the ECG may be indicative of the heart's ability to pump blood effectively.

2. If the feature value is "no", indicating no ventricular contractions, it may suggest that the patient is less likely to have chronic heart failure. The absence of ventricular contractions could indicate a healthier functioning heart.

3. If the feature value is "yes", indicating the presence of ventricular contractions, it may suggest that the patient is more likely to have chronic heart failure. Ventricular contractions could be a sign of the heart's inability to pump blood effectively.

Based on this analysis, the dictionary would look like:

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

In this case, the value "no" would be included in the list for the "no" class, and the value "yes" would be included in the list for the "yes" class. Since the feature is categorical and its categories are explicitly defined as "no" and "yes", there are no hard-to-predict values for the feature.