Based on prior knowledge, we cannot infer a direct relationship between the feature "np_05, LBBB (anterior branch) in the anamnesis" and the presence of chronic heart failure. The presence or absence of LBBB does not necessarily indicate the presence or absence of chronic heart failure.

However, to create the requested dictionary, we can assume that patients with a positive history of LBBB (np_05 = "yes") may have a higher likelihood of developing chronic heart failure compared to those without LBBB (np_05 = "no").

Based on this assumption, we can create the dictionary as follows:

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

Please note that in this case, the list of each target class will not be empty, but only contain the specific corresponding feature value.