Based on prior knowledge, the relationship between the feature "endocr_02" (Obesity in the anamnesis) and the task (presence of chronic heart failure) can be analyzed as follows:

- If the patient has obesity in their medical history, it could potentially increase the risk of chronic heart failure.
- On the other hand, if the patient does not have obesity in their medical history, it might reduce the risk of chronic heart failure.

Based on this analysis, the feature "endocr_02" can be related to the target variable where presence of obesity ("yes") might indicate a higher likelihood of chronic heart failure compared to absence of obesity ("no").

Here is the requested dictionary representing the possible values of the feature "endocr_02" for each target class:

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

In this case, both target classes have only one possible value for the feature "endocr_02".