Based on prior knowledge, the ECG rhythm at the time of admission to the hospital can provide some insight into whether the patient has chronic heart failure or not. Sinus rhythm with a heart rate above 90 is a common finding in patients with chronic heart failure.

Analysis:

- If the value of `ritm_ecg_p_07` is "no", it means that the ECG rhythm at the time of admission to the hospital is not sinus with a heart rate above 90. In this case, it is less likely for the patient to have chronic heart failure.
- If the value of `ritm_ecg_p_07` is "yes", it means that the ECG rhythm at the time of admission to the hospital is sinus with a heart rate above 90. In this case, it is more likely for the patient to have chronic heart failure.

Based on this analysis, we can create the following dictionary:

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

Please note that since the feature is a categorical variable, it only has two possible values: "no" and "yes".