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

Based on the given feature description, the feature `ritm_ecg_p_07` has two possible categories: "no" and "yes". For the task of determining whether the patient's myocardial infarction complications data shows chronic heart failure, it appears that there is a straightforward relationship between the feature and the target. If the value of `ritm_ecg_p_07` is "no", it suggests that there is no chronic heart failure present, and if the value is "yes", it indicates the presence of chronic heart failure. Therefore, the feature `ritm_ecg_p_07` directly corresponds to the target class, without any complex analysis required.