Based on prior knowledge, the feature GT_POST represents the presence or absence of paroxysms of ventricular tachycardia at the time of admission to the intensive care unit. To determine whether the patient has chronic heart failure, we need to analyze the relationship between this feature and the target variable.

To do this analysis, we will examine the GT_POST values for patients with and without chronic heart failure.

Let's create a dictionary with the possible values of GT_POST for each target class:

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

For patients with chronic heart failure (target class "yes"), there could be cases where GT_POST is both "no" and "yes". This indicates that some patients with chronic heart failure had paroxysms of ventricular tachycardia at the time of admission, while others did not. Hence, both "no" and "yes" are included in the list for target class "yes".

For patients without chronic heart failure (target class "no"), the GT_POST value is only "no". This means patients without chronic heart failure did not have paroxysms of ventricular tachycardia at the time of admission.

Please note that this analysis does not indicate the occurrence of chronic heart failure directly from the GT_POST feature, but rather provides the possible values of GT_POST for patients with and without chronic heart failure.