Based on the given feature description, it is unclear how the presence of essential hypertension relates to chronic heart failure. To determine the relationship, we would need additional information or data analysis. However, we can still create a dictionary to capture the possible values of feature GB for each target class. Please find the dictionary below:

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

Please note that since the relationship between feature GB and chronic heart failure is uncertain, it is difficult to make accurate predictions for all possible values of GB. Therefore, we have included the values that are provided, but it is important to consider that there may be other values that were not specified.