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

Based on the feature description, the feature `ritm_ecg_p_01` represents the ECG rhythm at the time of admission to the hospital. It is a categorical variable with two categories: 'yes' and 'no'. 

To determine if the patient has chronic heart failure, we need to analyze the relationship between this feature and the target variable of myocardial infarction complications. Since the feature directly indicates if the patient has sinus rhythm with a heart rate of 60-90, it does not provide any information about chronic heart failure specifically. Therefore, it is not possible to definitively determine if the patient has chronic heart failure based solely on this feature.

However, by creating the dictionary as stated above, we list the possible values for the feature `ritm_ecg_p_01` for each target class. In this case, since chronic heart failure is not directly related to this feature, the only possible value for both target classes is the existing category for this feature, 'no' and 'yes'.