```json
{
	"no": ["there is no essential hypertension"],
	"yes": ["Stage 2", "Stage 3", "Stage 1"]
}
```

Based on prior knowledge, I analyzed the relationship between the feature "GB" (Presence of an essential hypertension) and the task of determining whether the myocardial infarction complications data of the patient show chronic heart failure.

From the available categories for the feature GB, it can be inferred that the presence of essential hypertension (Stage 2, Stage 3, Stage 1) can be an indicator of chronic heart failure, while the absence of essential hypertension (there is no essential hypertension) may suggest no chronic heart failure.

Hence, the dictionary indicates that for the target class "no" (no chronic heart failure), the only possible value of feature GB is "there is no essential hypertension". On the other hand, for the target class "yes" (chronic heart failure), the possible values of feature GB are "Stage 2", "Stage 3", and "Stage 1".