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

Based on the given feature, it seems that the feature "LID_S_n" represents the use of lidocaine in the ICU. To determine if this feature is related to the presence of chronic heart failure, we can analyze the relationship between the values of this feature and the target variable.

In this case, the possible values for the feature 'LID_S_n' are 'yes' and 'no'. It is unclear how the use of lidocaine affects chronic heart failure, so we cannot make any conclusive statements about its relationship with the target variable. However, we can include the possible values of 'LID_S_n' for each target class in the dictionary.