```json
{
    "no": ["no"],
    "yes": ["yes"]
}
```
Based on the given feature description and task, the feature "endocr_01" represents the presence or absence of diabetes mellitus in the patient's medical history. 

To determine whether the patient shows chronic heart failure, we need to analyze the relationship between the target variable (myocardial infarction complications) and the feature "endocr_01". Unfortunately, the given data does not provide any specific information about the relationship between these two variables.

However, we can assume that having diabetes mellitus in the patient's medical history may increase the likelihood of developing chronic heart failure as diabetes mellitus is a known risk factor for heart diseases. Therefore, it is reasonable to assume that the presence of diabetes mellitus in the anamnesis (endocr_01 = "yes") may indicate a higher risk of chronic heart failure.

Since there are only two possible categories for the "endocr_01" feature ("no" and "yes"), and both categories could potentially be relevant for identifying chronic heart failure, we include all possible values of the feature in the generated dictionary.