```json
{
    "no": ["no"],
    "yes": ["yes"]
}
```

Based on my prior knowledge, chronic bronchitis in the anamnesis (zab_leg_01 feature) is a specific type of bronchitis that persists for a long time and may recur. Chronic bronchitis is typically unrelated to chronic heart failure and does not directly cause or indicate the presence of chronic heart failure.

In this analysis, we have determined that the possible values for the feature "zab_leg_01" are "no" and "yes". However, the presence or absence of chronic bronchitis in the anamnesis does not provide significant information for predicting the presence of chronic heart failure. Therefore, we can conclude that the feature "zab_leg_01" does not have a strong relationship with the target variable of chronic heart failure.