Based on the feature description, it is not immediately clear how the use of anticoagulants in the ICU relates to the presence of chronic heart failure in myocardial infarction complications. To establish the relationship, we need to analyze the correlation between the feature and the target variable.

To perform the analysis, we would collect data on patients who have experienced myocardial infarction complications and determine if they have chronic heart failure or not. We would then examine the distribution of GEPAR_S_n values for each target class and identify any patterns or trends.

Here is an example dictionary showcasing the possible values of the feature GEPAR_S_n for each target class:

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

Please note that this dictionary assumes there are only two possible values for the feature GEPAR_S_n: "yes" and "no". If there are additional values, it would be essential to include them in the dictionary, even if they are harder to predict.