Based on prior knowledge, it is expected that patients with chronic heart failure may have an ECG rhythm of sinus with a heart rate below 60 (ritm_ecg_p_08 = "yes"). Patients without chronic heart failure may have other ECG rhythm types or a sinus rhythm with a heart rate above 60 (ritm_ecg_p_08 = "no").

Based on this analysis, the dictionary can be generated as follows:

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

In this case, the only possible value for the "no" class is "no" and the only possible value for the "yes" class is "yes".