Based on prior knowledge, LBBB (Left Bundle Branch Block) on ECG can be associated with chronic heart failure. Therefore, it is reasonable to assume that the presence of LBBB on ECG (n_p_ecg_p_08 = 'yes') may indicate chronic heart failure in the patient.

Based on this analysis, the dictionary will be as follows:

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

Since the feature 'n_p_ecg_p_08' is a categorical variable with the categories 'no' and 'yes', we only need to consider these two possible values in the dictionary.