```json
{
    "no": ["no"],
    "yes": ["yes"]
}
```
Based on the feature description and the task, it seems that the feature "n_r_ecg_p_02" represents the presence or absence of frequent premature atrial contractions on the ECG at the time of admission to the hospital. 

Since the task is to determine whether chronic heart failure is shown by the myocardial infarction complications data of the patient, it is not clear how the presence or absence of frequent premature atrial contractions specifically relates to chronic heart failure. However, it is expected that the possible values for the "n_r_ecg_p_02" feature are either "no" or "yes". Therefore, the dictionaries for each target class would have either "no" or "yes" as the only possible value for the feature.