To analyze the relationship between the feature "STENOK_AN" and the task of determining if the myocardial infarction complications data of the patient shows chronic heart failure (CHF), we can examine the distribution of "STENOK_AN" values for each target class. 

Here is the analysis and the resultant dictionary:

- For the target class "no" (absence of chronic heart failure):
  - 'never'
  - 'during the last year'
  - 'more than 5 years ago'
  - '4-5 years ago'
  - 'one year ago'
  - 'two years ago'
  - 'three years ago'

- For the target class "yes" (presence of chronic heart failure):
  - 'during the last year'
  - '4-5 years ago'
  - 'one year ago'
  - 'two years ago'
  - 'three years ago'

Based on this analysis, the dictionary representation would be:

```json
{
	"no": ["never", "during the last year", "more than 5 years ago", "4-5 years ago", "one year ago", "two years ago", "three years ago"],
	"yes": ["during the last year", "4-5 years ago", "one year ago", "two years ago", "three years ago"]
}
```
(Note: The order of values within each list may vary, as long as the values are included.)