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

Based on the given feature description and task, it seems that the feature "fibr_ter_06" represents whether the patient has received fibrinolytic therapy by Celiasum 500k IU. To determine if the patient shows chronic heart failure, we need to analyze the relationship between this feature and the target variable.

Since there are only two possible categories for the feature (i.e., "no" and "yes"), we can create a dictionary that lists the possible values of the feature for each target class.

In this case, all patients have received fibrinolytic therapy by Celiasum 500k IU. Therefore, both the "no" and "yes" target classes will have "yes" listed as the possible value for the feature.