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

Based on the feature description, the n_p_ecg_p_11 feature indicates whether the patient has incomplete RBBB (Right Bundle Branch Block) on ECG (Electrocardiogram) at the time of admission to the hospital. 

Since the feature is categorical with two possible values - 'no' and 'yes', we can analyze the relationship between this feature and the presence of chronic heart failure.

The dictionary shows that for patients without chronic heart failure ("no" class), the only possible value for n_p_ecg_p_11 is "no". This indicates that when patients do not have incomplete RBBB, they are more likely to not have chronic heart failure.

For patients with chronic heart failure ("yes" class), the only possible value for n_p_ecg_p_11 is "yes". This suggests that when patients have incomplete RBBB on ECG at the time of admission, there is a higher likelihood of chronic heart failure.

Please note that it is assumed that there are no other possible values for n_p_ecg_p_11 apart from 'no' and 'yes'.