```json
{
	"no": ["no"],
	"yes": ["yes"]
}
```
Based on the given feature "zab_leg_04", which represents chronic pneumonia in the patient's medical history, it can be directly inferred that if the value of this feature is "yes", it indicates the presence of chronic pneumonia in the anamnesis, which may potentially contribute to the occurrence of myocardial infarction complications. Conversely, if the value is "no", it suggests the absence of chronic pneumonia in the anamnesis, which may lead to a negative result for chronic heart failure.