From my prior knowledge, a Type 1 Second-degree AV block (Mobitz I/Wenckebach) on an electrocardiogram (ECG) is a type of heart block that indicates a delay in the conduction of electrical signals through the atrioventricular (AV) node of the heart. This can result in a slow or irregular heart rate. 

To analyze the relationship between the feature "n_p_ecg_p_04" and the task of determining chronic heart failure, we can consider the following possibilities:

1. If the value of "n_p_ecg_p_04" is "no", it implies that the patient does not have a Type 1 Second-degree AV block on ECG at the time of admission. In this case, it is less likely that the patient has chronic heart failure, as this specific ECG pattern is not typically associated with chronic heart failure.

2. If the value of "n_p_ecg_p_04" is "yes", it indicates that the patient has a Type 1 Second-degree AV block on the ECG at the time of admission. While this ECG finding alone does not definitively confirm chronic heart failure, it can be considered as a potential factor contributing to the condition.

Based on this analysis, we can create the dictionary as follows:

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

The dictionary indicates that for the target class "no" (not showing chronic heart failure), the possible value of the feature "n_p_ecg_p_04" is "no". For the target class "yes" (showing chronic heart failure), the possible value of the feature "n_p_ecg_p_04" is "yes".

Please note that the list of values for each target class only includes the values that are relevant to the relationship between the feature and the task.