```json
{
	"no": ["no"],
	"yes": ["yes"]
}
```
Based on the given feature description, the feature "n_p_ecg_p_08" represents the presence of LBBB (anterior branch) on ECG at the time of admission to the hospital. Since the feature is a categorical variable with only two possible categories: "no" and "yes", we can directly map these categories to the target classes of "no" and "yes" representing chronic heart failure. Therefore, for the target class "no" (patients without chronic heart failure), the only possible value for the feature "n_p_ecg_p_08" is "no". Similarly, for the target class "yes" (patients with chronic heart failure), the only possible value for the feature "n_p_ecg_p_08" is "yes".