Based on my prior knowledge, the feature "ASP_S_n" represents the use of acetylsalicylic acid in the ICU for a patient. Acetylsalicylic acid, commonly known as aspirin, is often prescribed to patients to prevent blood clotting and reduce the risk of myocardial infarction complications. 

To analyze the relationship between the feature "ASP_S_n" and the presence of chronic heart failure, we can look at the historical data and focus on patients who have experienced myocardial infarction complications. We can then determine if the use of acetylsalicylic acid in the ICU is associated with the presence or absence of chronic heart failure.

Using this analysis, we can generate the following dictionary:

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

In this case, since the feature "ASP_S_n" is a categorical variable with only two categories ('yes' and 'no'), we can conclude that the use of acetylsalicylic acid in the ICU does not provide substantial information in predicting the presence of chronic heart failure. The list of values for both target classes is ['yes'] for chronic heart failure and ['no'] for no chronic heart failure.