Based on my prior knowledge, the feature O_L_POST represents the presence or absence of pulmonary edema at the time of admission to the intensive care unit (ICU). Myocardial infarction complications can sometimes lead to chronic heart failure, so it is important to analyze the relationship between O_L_POST and the presence of chronic heart failure.

To analyze the relationship, we can look at the distribution of O_L_POST for patients with and without chronic heart failure.

Possible values of O_L_POST for patients without chronic heart failure (target class no):
- 'no'

Possible values of O_L_POST for patients with chronic heart failure (target class yes):
- 'no'
- 'yes'

Based on this analysis, the dictionary would be:

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