Based on prior knowledge, it is possible that obesity in the anamnesis (endocr_02) can be associated with chronic heart failure. However, it is important to note that the presence or absence of chronic heart failure cannot be definitively determined based solely on the feature "endocr_02". 

To conduct a thorough analysis of the relationship between the feature and the task, we would need access to additional data and potentially perform statistical analyses, such as chi-square test or logistic regression, to quantify the association between obesity in the anamnesis and chronic heart failure.

However, based on the available information, we can create a dictionary that includes the possible values of the feature "endocr_02" for each target class:

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

Note that the dictionaries for both target classes contain only a single possible value based on the given feature description.