Based on prior knowledge, it is difficult to predict how the feature "n_p_ecg_p_11" relates to the presence of chronic heart failure in myocardial infarction complications data. However, we can analyze the relationship by examining the values of the feature for each target class.

Here is the dictionary with the analysis of the relationship between the feature and the task:

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

Explanation:
- For the target class "no" (indicating no chronic heart failure), the only possible value for the feature "n_p_ecg_p_11" is "no".
- For the target class "yes" (indicating chronic heart failure), the only possible value for the feature "n_p_ecg_p_11" is "yes".

Note: Since there are no other possible values for the feature, the lists for each target class contain only one element.