Based on prior knowledge, there is a relationship between the duration of arterial hypertension (DLIT_AG) and the presence of chronic heart failure. It is expected that patients with a longer duration of arterial hypertension may have a higher likelihood of developing chronic heart failure.

To analyze the relationship between DLIT_AG and chronic heart failure, we need a dataset that provides DLIT_AG values along with the myocardial infarction complications data.

Based on the provided feature description, we can create a dictionary that captures the possible values of DLIT_AG for each target class:

```json
{
	"no": ["there was no arterial hypertension"],
	"yes": ["more than 10 years", "6-10 years", "three years", "two years", "one year", "five years", "four years"]
}
```

In this case, the "no" target class contains only one possible value for DLIT_AG, which is "there was no arterial hypertension." The "yes" target class, on the other hand, includes multiple possible values related to different durations of arterial hypertension.

Please note that without actual data, it is impossible to determine the exact relationship between DLIT_AG and chronic heart failure. The relationship mentioned here is based on general knowledge and assumptions.