```json
{
	"no": ["no"], 
	"yes": ["yes"]
}
```
Based on the feature description and task, it seems that the feature "O_L_POST" represents the presence or absence of pulmonary edema at the time of admission to the intensive care unit. To determine if the patient has chronic heart failure, we need to analyze the relationship between this feature and the target variable.

Looking at the possible values of the feature, we can see that it is a categorical variable with two categories: "no" and "yes". From these categories, it is difficult to predict if the patient has chronic heart failure.

Therefore, in the dictionary, we include the possible values of the feature "O_L_POST" for each target class. Since it is not clear how the feature relates to the target variable, we include all possible values of "O_L_POST" for both the "no" and "yes" target class.