Based on prior knowledge, the feature "endocr_02" representing obesity in the patient's medical history may have a relationship with the presence of chronic heart failure in myocardial infarction complications data.

To analyze the relationship, we can compare the distribution of the feature "endocr_02" between patients with chronic heart failure (target class: yes) and those without chronic heart failure (target class: no).

Here is the dictionary with the specific details:

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

Explanation:
- For patients without chronic heart failure, the possible value for the feature "endocr_02" is "no".
- For patients with chronic heart failure, the possible value for the feature "endocr_02" is "yes".

Note: Since the categories for "endocr_02" are binary ('no' and 'yes'), we only have one possible value for each target class.