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

Based on the given feature description and task, it seems that the presence or absence of paroxysms of supraventricular tachycardia on ECG at the time of admission to the hospital (n_r_ecg_p_08) is being used to determine if the patient has chronic heart failure.

The feature is a categorical variable with two possible values: "no" and "yes". Therefore, the feature values for the target class "no" would consist of the value "no", and the feature values for the target class "yes" would consist of the value "yes".