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

Based on the given feature and task, the feature "NITR_S" represents the use of liquid nitrates in the ICU. The target variable is the presence or absence of chronic heart failure in the patient's myocardial infarction complications data.

As per the feature description, the possible values for "NITR_S" are 'no' and 'yes'. Since there is no information provided about the relationship between the feature and the target, it is difficult to predict how the feature "NITR_S" is related to the presence or absence of chronic heart failure.

Therefore, the dictionary includes all possible values for the feature in both target class categories to provide a complete representation of the data.