Based on prior knowledge, it is difficult to determine the relationship between a third-degree AV block in the anamnesis (feature np_04) and the presence of chronic heart failure. 

For the purpose of analysis, we can assume that if a patient has a history of a third-degree AV block (np_04 = 'yes'), it may indicate a higher risk of developing chronic heart failure. Conversely, if a patient does not have a history of a third-degree AV block (np_04 = 'no'), it may suggest a lower risk of developing chronic heart failure. However, it is important to note that this assumption may not hold true in all cases.

Based on the above analysis, the dictionary for the given feature would be:

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

Please note that since the feature has only two categories ('no' and 'yes'), the lists for each target class contain only one value which corresponds to the feature value itself.