```json
{
	"no": ["no"],  
	"yes": ["yes"]
}
```
Based on the given feature description and task, it appears that the feature "n_p_ecg_p_04" represents the presence or absence of Type 1 Second-degree AV block (Mobitz I/Wenckebach) on ECG at the time of admission to the hospital.

Since the task is to determine whether the myocardial infarction complications data shows chronic heart failure, we need to analyze how this feature relates to chronic heart failure.

From the available information, we can see that the feature has two possible categories: "no" and "yes". It is unclear exactly what these categories represent in terms of chronic heart failure, but we can assume that "no" indicates the absence of a Type 1 Second-degree AV block, while "yes" indicates its presence.

Given this analysis, the dictionary can be constructed as shown above.