Based on prior knowledge, there is a possible relationship between obesity (endocr_02) and chronic heart failure in patients with myocardial infarction complications. Obesity has been shown to be a risk factor for developing heart failure.

To analyze the relationship between the feature endocr_02 and the presence of chronic heart failure, we need access to data that includes both the feature and the target variable. We can then examine the distribution of endocr_02 values for patients with and without chronic heart failure.

Unfortunately, without access to the actual data, it is difficult to perform a specific analysis. However, based on general knowledge, we can assume that patients with endocr_02 = 'yes' (obesity in the anamnesis) may have a higher likelihood of developing chronic heart failure.

As per the instructions, we will create a dictionary with the possible values of endocr_02 for each target class (yes and no).

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

In this case, there is only one possible value for both target classes, but this dictionary can be updated with additional values depending on the available data.