Based on prior knowledge, there is a known relationship between diabetes mellitus (endocr_01) and the development of chronic heart failure (target variable). 

Patients with diabetes mellitus are known to be at higher risk for developing chronic heart failure. Therefore, it is likely that the presence of diabetes mellitus in the anamnesis (endocr_01) would indicate a higher likelihood of chronic heart failure (yes).

Here's the dictionary with the possible values of feature endocr_01 for each target class:

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

In this case, since the feature is categorical with only two possible values ('no' and 'yes'), all patients with chronic heart failure are likely to have diabetes mellitus in the anamnesis (endocr_01 = 'yes'). Therefore, the target class "yes" includes all patients with chronic heart failure. The feature value "no" is not relevant in this case, as chronic heart failure is only present when endocr_01 is "yes".