```json
{
    "no": ["no"],
    "yes": ["yes"]
}
```
Based on the provided feature description, the feature "n_r_ecg_p_06" is a categorical variable with two possible categories: "no" and "yes". 

In the context of the task, which is to determine if the patient shows chronic heart failure, the feature "n_r_ecg_p_06" does not provide any additional information to make a prediction. The feature values, "no" and "yes", do not indicate any specific relationship with chronic heart failure. As a result, the dictionary includes only the possible values of the feature for each target class.