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

In this case, since the feature "fibr_ter_05" represents whether the patient has received Fibrinolytic therapy by Streptase, the possible values for this feature are "no" and "yes". 

Based on the given task of determining whether the patient shows chronic heart failure, there is no specific information provided to establish a direct relationship between this feature and the presence of chronic heart failure. Therefore, the relationship between the feature "fibr_ter_05" and chronic heart failure cannot be analyzed using prior knowledge. 

However, as per the format mentioned, the dictionary presents the possible values of the feature "fibr_ter_05" for each target class. In this case, both target classes ("no" and "yes") have only one possible value: "no" for "no" class and "yes" for "yes" class.