Based on my prior knowledge, I can analyze the relationship between the feature GT_POST (Paroxysms of ventricular tachycardia at the time of admission to the intensive care unit) and the presence of chronic heart failure in the myocardial infarction complications data.

It is possible that patients who have experienced paroxysms of ventricular tachycardia at the time of admission to the intensive care unit (GT_POST = 'yes') may have a higher likelihood of developing chronic heart failure. This is because ventricular tachycardia is a serious arrhythmia that can be a sign of underlying heart disease. Additionally, patients with ventricular tachycardia may have poorer cardiac function, which can lead to the development of heart failure over time.

On the other hand, patients who did not experience paroxysms of ventricular tachycardia at the time of admission to the intensive care unit (GT_POST = 'no') may have a lower likelihood of developing chronic heart failure. However, it is important to note that patients without ventricular tachycardia can still develop heart failure due to other factors such as pre-existing conditions or subsequent complications.

Based on this analysis, the dictionary representing the relationship between the feature GT_POST and the presence of chronic heart failure can be formulated as follows:

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

Please note that since GT_POST is a categorical variable with only two possible values ('no' and 'yes'), the mapping to respective target classes is straightforward in this case.