```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 the electrocardiogram (ECG) at the time of admission to the hospital. The task is to determine whether this patient has chronic heart failure based on the myocardial infarction complications data.

From the given description, the feature "n_p_ecg_p_04" is a categorical variable with two possible categories: "no" and "yes". The analysis indicates that the presence of Type 1 Second-degree AV block (Mobitz I/Wenckebach) on the ECG at the time of admission to the hospital can be an indicator of chronic heart failure.

The dictionary provided above specifies the possible values of the feature "n_p_ecg_p_04" for each target class. In this case, the target classes are "no" (indicating the absence of chronic heart failure) and "yes" (indicating the presence of chronic heart failure). As per the analysis, the feature value for the "no" class is ["no"] and for the "yes" class is ["yes"].