Based on prior knowledge, it is possible that patients with chronic heart failure may experience paroxysms of ventricular tachycardia at the time of admission to the intensive care unit (ICU). Therefore, there may be some relationship between the feature GT_POST and the presence of chronic heart failure.

To analyze this relationship, we need to examine the values of feature GT_POST for patients with and without chronic heart failure (target variable). If we find that most patients with chronic heart failure have a specific value or range of values for GT_POST, we can conclude that there is a relationship between the feature and the target variable.

Based on the available information, we are instructed to create a dictionary with the possible values of GT_POST for each target class (yes and no).

Here is the dictionary:

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

Since there are only two possible values for GT_POST ("yes" and "no"), we include both values in the dictionary for each target class.