Based on the given feature description and task, we are trying to analyze the relationship between the feature "FK_STENOK" and the occurrence of chronic heart failure (CHF).

To analyze this relationship, we need prior knowledge about how functional class of angina pectoris relates to chronic heart failure. Typically, a higher functional class (e.g., IV FC) indicates more severe angina symptoms and may be associated with a higher likelihood of chronic heart failure.

Based on this understanding, we can create a dictionary with the possible values of the "FK_STENOK" feature for each target class, "yes" and "no":

```json
{
    "no": ["there is no angina pectoris", "I FC"],
    "yes": ["II FC", "IV FC", "III FC."]
}
```

This dictionary suggests that the presence of angina pectoris in functional classes II, IV, or III increases the likelihood of chronic heart failure (CHF) compared to the absence of angina pectoris or angina in class I.

Please note that this analysis assumes a general relationship based on prior knowledge. The specific relationship between the "FK_STENOK" feature and chronic heart failure may vary depending on the dataset and additional factors.