```json
{
    "no": ["no"],
    "yes": ["yes"]
}
```
Based on the given feature and task, the feature "zab_leg_03" represents the presence of bronchial asthma in the patient's medical history. 

For the target class "no" (chronic heart failure not present), the only possible value for the feature is "no" (meaning no bronchial asthma in the anamnesis).

For the target class "yes" (chronic heart failure present), the only possible value for the feature is "yes" (indicating the presence of bronchial asthma in the medical history).

Therefore, the dictionary shows that for both target classes, the value of the feature "zab_leg_03" is either "no" or "yes" respectively.