```json
{
    "no": ["no"],
    "yes": ["yes"]
}
```
Based on the feature description, it appears that the feature "n_p_ecg_p_09" is related to the presence or absence of Incomplete LBBB on ECG at the time of admission to the hospital. The feature is a categorical variable with two possible categories: "no" and "yes".

To determine if the patient shows chronic heart failure, we need to analyze the relationship between this feature and the target variable. However, based on the feature description alone, it is not possible to directly infer whether the patient has chronic heart failure or not.

In this case, the feature "n_p_ecg_p_09" does not provide sufficient information to determine the presence of chronic heart failure. More information or additional features are needed for accurate prediction.