Based on prior knowledge, there is no direct relationship between the presence of essential hypertension (feature GB) and chronic heart failure (target variable). However, hypertension is a common comorbidity in patients with chronic heart failure, so it is possible that patients with chronic heart failure may have a higher likelihood of having essential hypertension.

Here is the dictionary that captures the relationship between the feature GB and the target variable:

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

Since there is no direct relationship between the feature GB and chronic heart failure, patients with no essential hypertension (GB = "there is no essential hypertension") are categorized under the "no" class for the target variable. On the other hand, patients with any stage of essential hypertension (GB = "Stage 1", "Stage 2", "Stage 3") are categorized under the "yes" class for the target variable.

Note that this analysis assumes no other relevant features are considered and that the relationship between the feature GB and chronic heart failure is only being evaluated.