Based on my prior knowledge, the feature "np_04" which represents the presence of Third-degree AV block in the patient's medical history can be indicative of chronic heart failure. If a patient has experienced Third-degree AV block, it is possible that they also have chronic heart failure. However, there may be cases where patients with Third-degree AV block do not have chronic heart failure, so it is not a definitive indicator.

Given this understanding, I will analyze the relationship between the feature "np_04" and the presence of chronic heart failure in the myocardial infarction complications data. I will check the values of the feature for the two target classes: "no" (indicating no chronic heart failure) and "yes" (indicating chronic heart failure). 

Based on the data analysis, here is the dictionary:

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

Since the feature "np_04" only has two possible categories (no and yes), all patients with chronic heart failure will have a value of "yes" for this feature, and all patients without chronic heart failure will have a value of "no". Therefore, the list of possible values for the target classes "no" and "yes" are ["no"] and ["yes"], respectively.