Based on the provided feature description and task, we are analyzing the relationship between the feature "STENOK_AN" and the presence of chronic heart failure.

From the given feature description, it is not explicitly mentioned how the feature "STENOK_AN" is related to chronic heart failure. However, we can make some assumptions based on prior knowledge. Exertional angina pectoris is a symptom of coronary artery disease, which can be a contributing factor to chronic heart failure. Therefore, it is reasonable to expect a potential relationship between the feature "STENOK_AN" and chronic heart failure. 

To create the dictionary, we need to analyze the values of feature "STENOK_AN" for each target class (yes or no) in terms of chronic heart failure. Here is an example dictionary:

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

In this dictionary, the "no" key represents the target class without chronic heart failure, and the associated value is a list of possible values of feature "STENOK_AN" for that class. Similarly, the "yes" key represents the target class with chronic heart failure, and the associated value is a list of possible values of feature "STENOK_AN" for that class.

Please note that the specific values in the lists are just examples, and depending on the data and analysis, there might be different values or the list of values might change. The goal is to provide an illustration of how the dictionary should look like.