Based on prior knowledge, it can be assumed that patients with myocardial infarction complications who have a sinus ECG rhythm with a heart rate below 60 (ritm_ecg_p_08 = "yes") are more likely to show chronic heart failure compared to those who do not have this condition (ritm_ecg_p_08 = "no").

The dictionary will have the following format:

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

Since the ritm_ecg_p_08 feature is a categorical variable with only two possible categories ("yes" and "no"), it is not necessary to include any other values in the dictionary.