Based on prior knowledge, we can analyze the relationship between the feature "GB" (Presence of an essential hypertension) and the presence of chronic heart failure in the myocardial infarction complications data of a patient.

To determine if there is a relationship, we can look at the potential impact of essential hypertension on the development of chronic heart failure. Essential hypertension, also known as primary or essential high blood pressure, is a condition where there is persistent elevation of blood pressure without any identifiable cause. It is a significant risk factor for the development of chronic heart failure.

Given the categorical variable "GB" with categories ['there is no essential hypertension', 'Stage 2', 'Stage 3', 'Stage 1'], we can hypothesize that individuals with higher stages of essential hypertension (Stage 2 and Stage 3) are more likely to develop chronic heart failure compared to those with no essential hypertension or Stage 1 hypertension.

To create the requested dictionary, we need to determine the possible values of feature "GB" for each target class (yes or no) indicating the presence or absence of chronic heart failure.

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

This dictionary suggests that individuals with chronic heart failure are likely to have essential hypertension, specifically at Stage 2 or Stage 3. However, it does not provide information about individuals without chronic heart failure who may have essential hypertension at different stages or those without any essential hypertension.

Please note that further analysis or statistical modeling may be required to validate the relationship between the feature and the task more accurately.