Based on prior knowledge, LBBB (Left Bundle Branch Block) on ECG is a condition that affects the electrical conduction system of the heart. It is associated with various heart conditions, including chronic heart failure. Therefore, it is possible that the presence of LBBB on ECG at the time of admission to the hospital (n_p_ecg_p_08) can indicate the existence of chronic heart failure in a patient.

To analyze the relationship between n_p_ecg_p_08 and chronic heart failure, we can examine the possible values of n_p_ecg_p_08 for each target class (yes and no) in the myocardial infarction complications data. Based on these values, we can create a dictionary as requested.

Here is the dictionary for the given feature and task:

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

In this case, the possible values of n_p_ecg_p_08 for the target class "no" is "no" and for the target class "yes" is "yes".