Based on prior knowledge, there is a potential relationship between obesity in the anamnesis (feature: endocr_02) and the presence of chronic heart failure. 

To analyze the relationship, we need to examine the data and determine the distribution of endocr_02 values for the two target classes (yes and no) of chronic heart failure.

Here is a possible analysis:

- Target class: yes (chronic heart failure)
    - Possible values of endocr_02: 
        - 'yes'
        - 'no'

- Target class: no (no chronic heart failure)
    - Possible values of endocr_02: 
        - 'yes'
        - 'no'

Based on this analysis, the relationship between the feature endocr_02 and chronic heart failure can be summarized in the following dictionary:

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

Please note that the values present in endocr_02 for both target classes are the same, indicating that the feature might not have a strong relationship with chronic heart failure. However, the provided information does not suggest any specific values that are hard to predict, so all possible values are included in the dictionary for both target classes.