After conducting a thorough analysis of the relationship between the feature STENOK_AN and the task of determining if the myocardial infarction complications data shows chronic heart failure, the following conclusions can be made:

There is a potential association between the feature STENOK_AN (exertional angina pectoris in the anamnesis) and the presence of chronic heart failure. 

Based on prior knowledge, it is likely that patients who have experienced exertional angina pectoris in the anamnesis during the last year or within the past few years (categories: 'during the last year', '4-5 years ago', 'one year ago', 'two years ago', 'three years ago') are more likely to exhibit chronic heart failure. On the other hand, patients who have never experienced exertional angina pectoris or have had it more than 5 years ago may be less likely to have chronic heart failure.

Using this analysis, the dictionary can be created as follows:

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

In this dictionary, the "no" key represents the target class of patients without chronic heart failure, and the associated values are the possible values of the feature STENOK_AN for that target class. The "yes" key represents the target class of patients with chronic heart failure, and the associated values are the possible values of the feature STENOK_AN for that target class.

Note: It is important to note that this analysis is based on prior knowledge and general assumptions. The actual relationship between the feature and target can be validated through statistical analysis and machine learning models.