Based on prior knowledge, chronic heart failure is a common consequence of myocardial infarction (heart attack). Therefore, it is likely that the myocardial infarction complications data of this patient will show chronic heart failure (yes). However, a thorough analysis is required to confirm this relationship between the feature and the task.

To analyze the relationship between the feature L_BLOOD (White blood cell count) and the task of determining chronic heart failure, we can look at typical ranges of white blood cell count for individuals with and without chronic heart failure.

Typically, the normal range of white blood cell count is between 4.0 and 11.0 billion per liter. However, in the context of chronic heart failure, elevated white blood cell count (leukocytosis) can be observed. Values above the normal range, such as 15.0 or higher, are often associated with chronic heart failure.

Based on this analysis, the dictionary with typical values of L_BLOOD for each target class (no and yes) can be created as follows:

```json
{
  "no": [4.5, 5.2, 6.7, 7.9, 8.3],
  "yes": [10.1, 14.7, 16.9, 18.2, 20.5]
}
```

Note that these are just example values and ranges. The actual values may vary based on the specific dataset and characteristics of patients included.