Based on the feature description and the task, we are trying to determine if there is a relationship between the feature "STENOK_AN" and the presence of chronic heart failure.

To analyze the relationship, we will examine the distribution of the "STENOK_AN" categories for each target class separately. We will then create a dictionary with the values for "STENOK_AN" in each target class.

Here is the dictionary:

```json
{
    "no": ["never", "more than 5 years ago", "4-5 years ago"],
    "yes": ["during the last year", "one year ago", "two years ago", "three years ago"]
}
```

Note: It is important to note that this analysis is based on prior knowledge and assumptions. If the specific relationship between "STENOK_AN" and chronic heart failure is not clearly defined or there is insufficient data, the analysis and resulting dictionary may not be accurate.