```json
{
  "no": ["no"],
  "yes": ["yes"]
}
```
Based on the feature "endocr_01" which indicates the presence or absence of diabetes mellitus in the patient's medical history, the analysis shows that for patients without chronic heart failure, the possible value for the "endocr_01" feature is "no". On the other hand, for patients with chronic heart failure, the possible value for the "endocr_01" feature is "yes".