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

Based on the given information, the feature "fibr_ter_07" has two possible values: "no" and "yes". 
For the target class "no" (where chronic heart failure is not present), the only possible value of "fibr_ter_07" is "no". 
For the target class "yes" (where chronic heart failure is present), the only possible value of "fibr_ter_07" is "yes".