Based on my prior knowledge, pulmonary edema at the time of admission to the intensive care unit (O_L_POST) is a possible complication of myocardial infarction. Chronic heart failure can also be a complication of myocardial infarction. However, it is difficult to directly determine if a patient has chronic heart failure or not based solely on the presence of pulmonary edema at the time of admission to the ICU. Other factors such as patient history, additional diagnostic tests, and medical examination would be necessary to accurately diagnose chronic heart failure.

Nevertheless, I can analyze the relationship between the feature O_L_POST and the target variable (chronic heart failure) to provide you with insights.

Here is the dictionary representing the relationship between the feature and target variable:

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

Since the feature O_L_POST is a categorical variable with only two categories ("no" and "yes"), I have included both categories in the dictionary. However, please note that more specific medical data, diagnostic tests, and patient history would be required to accurately determine the presence of chronic heart failure.