Based on prior knowledge, there is a correlation between gender and the risk of chronic heart failure in patients with myocardial infarction complications. It has been observed that males are at a higher risk of developing chronic heart failure compared to females.

Here is the dictionary with the possible values of the feature SEX for the target classes "no" and "yes":

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

The "no" class includes only the female gender, indicating that females are less likely to develop chronic heart failure. The "yes" class includes both male and female genders, suggesting that both genders are at risk of developing chronic heart failure.