Based on prior knowledge, the feature "FK_STENOK" represents the functional class of angina pectoris in the last year. Angina pectoris is chest pain or discomfort that occurs when the heart muscle doesn't receive enough oxygen-rich blood. The functional class categorizes the severity of angina symptoms and their impact on daily activities.

To analyze the relationship between "FK_STENOK" and the presence of chronic heart failure as the target variable, we can examine the possible values of "FK_STENOK" and their association with chronic heart failure. 

Here is the dictionary representing the relationship between "FK_STENOK" and the target variable "chronic heart failure":

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

In this case, individuals with "FK_STENOK" values of "there is no angina pectoris" or "I FC" are less likely to have chronic heart failure. On the other hand, the presence of chronic heart failure is more common among patients with "II FC", "IV FC", or "III FC." 

Note that we exclude any hard-to-predict values or categories that were not mentioned explicitly.