From the feature n_p_ecg_p_04, we can analyze the relationship between Type 1 Second-degree AV block (Mobitz I/Wenckebach) on ECG at the time of admission to hospital and the presence of chronic heart failure in the patient.

Based on prior knowledge, there are a few possible scenarios:

1. If the feature value is "no", it means that the patient does not have Type 1 Second-degree AV block (Mobitz I/Wenckebach) on ECG at the time of admission to the hospital. In this case, there is a possibility that the patient does not have chronic heart failure. However, other factors need to be considered for a definitive conclusion.

2. If the feature value is "yes", it means that the patient has Type 1 Second-degree AV block (Mobitz I/Wenckebach) on ECG at the time of admission to the hospital. In this case, there is a possibility that the patient has chronic heart failure. However, additional information is needed to confirm the presence of chronic heart failure.

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

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

This dictionary shows the possible values of the feature n_p_ecg_p_04 for both target classes - "no" and "yes". In this case, the only possible value for each target class is the same as the original feature value.