Based on prior knowledge, it is expected that patients with Third-degree AV block in the anamnesis (np_04) are more likely to show chronic heart failure. 

To analyze the relationship between the feature np_04 and the task of determining chronic heart failure, we can examine the distribution of np_04 values for each target class.

Here is the dictionary with the analysis:

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

Since the feature np_04 only has two possible categories ("no" and "yes"), we can directly assign those categories to the respective target classes ("no" and "yes"). The list for each target class contains the corresponding values of np_04.

Please note that since there are only two categories for np_04, it is not necessary to include any other values in the dictionary.