Based on prior knowledge, White blood cell count (L_BLOOD) is not a direct indicator of chronic heart failure. However, it can provide information on the patient's overall health status and immune response. To determine the relationship between L_BLOOD and the presence of chronic heart failure, we can consider typical ranges of values for both groups.

Typical ranges for White blood cell count (L_BLOOD) vary depending on the source, but for this analysis, we will assume the following approximate ranges:
- Normal range: 4.5-11.0 billion per liter
- Elevated range: Above 11.0 billion per liter

Considering these ranges, we can analyze the relationship between L_BLOOD and chronic heart failure (task) and create a dictionary with typical L_BLOOD values for each target class:

```json
{
	"no": [9.5, 6.2, 7.8, 5.1, 8.7],
	"yes": [12.3, 10.5, 11.8, 9.9, 12.9]
}
```

Note that we are assuming that the "no" class refers to patients without chronic heart failure, while the "yes" class refers to patients with chronic heart failure. The provided L_BLOOD values are representative examples and may not be exhaustive.