Based on prior knowledge, essential hypertension is a risk factor for chronic heart failure. Therefore, it is reasonable to assume that the presence of essential hypertension (GB) may be related to the occurrence of chronic heart failure. In order to analyze the relationship between the feature and the task, we need to examine the myocardial infarction complications data for patients with and without chronic heart failure and observe the presence of essential hypertension in each group.

After conducting the analysis, the dictionary can be generated as follows:

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

In this case, patients without chronic heart failure (target class "no") only have the category of "there is no essential hypertension". On the other hand, patients with chronic heart failure (target class "yes") have the categories "Stage 2", "Stage 3", and "Stage 1" as possibilities for essential hypertension. It is important to note that this analysis is based on the given feature and task, and other features may also affect the presence of chronic heart failure.