Based on my prior knowledge, the duration of arterial hypertension (DLIT_AG) can be a potential risk factor for chronic heart failure. 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 the presence of chronic heart failure, we can examine the distribution of DLIT_AG categories for each target class (yes and no) in the myocardial infarction complications data.

Below is the dictionary that captures the relationship between the DLIT_AG feature and the presence of chronic heart failure:

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

In the dictionary, we include all the DLIT_AG categories that are available in the data for each target class. I have excluded "two years" and "one year" from the "yes" list because they could be considered as "hard to predict".

It's important to note that this analysis is based on general knowledge and assumptions. The specific relationship between DLIT_AG and chronic heart failure may vary depending on the specific dataset and any domain-specific factors.