```json
{
    "no": ["yes"],
    "yes": ["yes"]
}
```
Based on the feature description, the ritm_ecg_p_01 feature indicates the ECG rhythm at the time of admission to the hospital. The possible values for this feature are 'yes' and 'no'. 

To analyze the relationship between the feature and the presence of chronic heart failure (target variable), we can observe the values of the feature for patients who do not have chronic heart failure (target class 'no') and those who have chronic heart failure (target class 'yes').

From the given task, it is mentioned that the patient has myocardial infarction complications data. However, it does not provide clear information about the relationship between this particular feature and chronic heart failure. Therefore, based on the available information, it is difficult to predict the exact relationship between the feature 'ritm_ecg_p_01' and chronic heart failure. 

However, we can assume that there might be cases where the ECG rhythm at the time of admission to the hospital (ritm_ecg_p_01) can be the same for both patients with chronic heart failure and those without chronic heart failure. Therefore, we can include 'yes' as a possible value for both target classes in the dictionary.