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

Based on my prior knowledge, the feature "endocr_01" represents whether the patient has a history of diabetes mellitus. To analyze the relationship between this feature and the presence of chronic heart failure, we can examine the cases where the target variable (myocardial infarction complications data) indicates the absence or presence of chronic heart failure.

From the available information, it can be inferred that if a patient has a history of diabetes mellitus (endocr_01 = "yes"), it is possible that they may have chronic heart failure. Similarly, if a patient has no history of diabetes mellitus (endocr_01 = "no"), it is likely that they do not have chronic heart failure.

Hence, the dictionary shows that the possible values of the feature "endocr_01" for the target class "no" (no chronic heart failure) are ["no"], and for the target class "yes" (chronic heart failure), the possible values of the feature "endocr_01" are ["yes"].