Based on prior knowledge, it is difficult to directly determine if the feature "endocr_02" (Obesity in the anamnesis) is directly related to the occurrence of chronic heart failure. However, it is known that obesity is a significant risk factor for the development of chronic heart failure.

To analyze the relationship between the feature and the task, we can examine the distribution of the feature among patients with and without chronic heart failure.

Here is the analysis of the feature "endocr_02" (Obesity in the anamnesis) in relation to the presence of chronic heart failure:

- For patients diagnosed with chronic heart failure:
    - Possible values of feature "endocr_02": ['no', 'yes']

- For patients without chronic heart failure:
    - Possible values of feature "endocr_02": ['no', 'yes']

Based on this analysis, we can create the following dictionary:

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

In this case, the possible values of the feature "endocr_02" are the same for both target class, regardless of the presence of chronic heart failure.