To analyze the relationship between the feature "GT_POST" (Paroxysms of ventricular tachycardia at the time of admission to the intensive care unit) and the target variable "chronic heart failure" in the myocardial infarction complications data, we can examine the distribution of the feature values for each target class.

Based on prior knowledge, ventricular tachycardia can be a potential symptom or complication of chronic heart failure. Therefore, it is reasonable to expect that patients with chronic heart failure may have a higher frequency of experiencing paroxysms of ventricular tachycardia at the time of admission to the ICU. 

Now, let's create the dictionary:

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

Since the feature "GT_POST" is a categorical variable with categories "no" and "yes", the dictionary above indicates that for patients without chronic heart failure, the feature value "GT_POST" will always be "no". Similarly, for patients with chronic heart failure, the feature value "GT_POST" will always be "yes".