Based on prior knowledge, it is known that gender (SEX) can be a factor in the development of chronic heart failure. However, it is important to note that gender alone may not be sufficient to accurately identify chronic heart failure. It is advisable to consider other relevant factors such as age, medical history, and diagnostic tests to determine the presence of chronic heart failure.

Here is the dictionary with the relationship between the feature (SEX) and the target (chronic heart failure):

```json
{
	"no": [
		"male",
		"female"
	],
	"yes": [
		"male",
		"female"
	]
}
```
The possible values for the feature SEX for both the target class "no" (no chronic heart failure) and "yes" (chronic heart failure) are the same, which include both "male" and "female". Please note that this analysis does not provide any specific information regarding the association between gender and chronic heart failure, as it is a general consideration based on prior knowledge.