```json
{
	"no": ["no"], 
	"yes": ["yes"] 
}
```
Based on the given feature description, the feature 'np_05' represents the presence or absence of left bundle branch block (LBBB) in the anterior branch in the patient's medical history. To determine if there is a relationship between this feature and the presence of chronic heart failure in myocardial infarction complications data, we can consider the following:

1. If the value of 'np_05' is 'no' (indicating no LBBB in the anterior branch in the anamnesis), it is possible that the patient does not have chronic heart failure. However, this does not necessarily mean that they are completely free from the condition. Other factors and symptoms need to be considered for a definitive conclusion.

2. If the value of 'np_05' is 'yes' (indicating the presence of LBBB in the anterior branch in the anamnesis), there is a possibility that the patient may have chronic heart failure. LBBB is associated with various cardiac conditions, and chronic heart failure can be one of them.

Therefore, based on this analysis, I have created a dictionary with the possible values of 'np_05' for each target class:

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

Please note that this analysis is based on general knowledge and assumptions, and it is always recommended to consult with a medical professional or refer to more specific and reliable data for accurate conclusions.