After conducting a thorough analysis of the relationship between the feature "GB" (presence of essential hypertension) and the task of determining if the patient has chronic heart failure, I can create a dictionary as follows:

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

This means that if the patient has no essential hypertension, the likelihood of having chronic heart failure is "no". On the other hand, if the patient has essential hypertension classified as Stage 2, Stage 3, or Stage 1, the likelihood of having chronic heart failure is "yes".