Based on prior knowledge, we can analyze the relationship between the feature "n_p_ecg_p_04" and the presence of chronic heart failure in patients with myocardial infarction complications.

In this case, a Type 1 Second-degree AV block (Mobitz I/Wenckebach) on ECG at the time of admission to the hospital is a categorical feature with two possible categories: "no" and "yes".

To determine if this feature is associated with chronic heart failure, we would need to analyze the data and determine the distribution of each category ("no" and "yes") within the target classes of chronic heart failure.

Here is a possible dictionary representing the analysis:

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

Since there are no other known possible values for the "n_p_ecg_p_04" feature, we can conclude that the presence of a Type 1 Second-degree AV block on ECG at the time of admission to the hospital does not provide any additional information about the possibility of chronic heart failure.