```json
{
	"no": ["no"],  
	"yes": ["yes"]
}
```
Based on the given feature description and the task of determining if the patient has chronic heart failure based on myocardial infarction complications data, the feature "n_r_ecg_p_05" can only take two possible values: "no" and "yes". 

If the feature value is "no", it suggests that there are no paroxysms of atrial fibrillation on the ECG at the time of admission to the hospital. If the feature value is "yes", it indicates that there are paroxysms of atrial fibrillation on the ECG at the time of admission to the hospital.

Since there are only two possible values for this feature, we can create a dictionary with these values based on their relationship with the target variable (chronic heart failure).