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

Based on the feature description, the `ritm_ecg_p_01` feature is a categorical variable with two possible categories: "yes" and "no". 

To determine if the myocardial infarction complications data of this patient shows chronic heart failure, we can directly map the values of `ritm_ecg_p_01` to the target class. 

If the value of `ritm_ecg_p_01` is "yes", it indicates that the ECG rhythm at the time of admission to the hospital is sinus with a heart rate of 60-90, which suggests that the patient does not have chronic heart failure.

On the other hand, if the value of `ritm_ecg_p_01` is "no", it indicates that the ECG rhythm at the time of admission to the hospital is not sinus with a heart rate of 60-90. This could potentially suggest the presence of chronic heart failure.

Since the feature description only provides two possible categories for `ritm_ecg_p_01`, we can create a dictionary with these categories as the possible values for each target class.