Based on prior knowledge, the relationship between the White blood cell count (L_BLOOD) and the presence of chronic heart failure can be analyzed. 

Typically, a high White blood cell count (leukocytosis) can indicate the presence of an infection or inflammation, which can be associated with chronic heart failure. Therefore, we can expect higher L_BLOOD values in patients with chronic heart failure.

Based on this analysis, here is the dictionary with the requested format, including typical L_BLOOD values for each target class:

```json
{
	"no": [4.5, 5.2, 4.7, 4.9, 4.8],
	"yes": [7.3, 6.9, 7.1, 6.7, 7.2]
}
```

Note: These values are fictitious and provided only as an example. The actual values should be derived from a dataset or domain-specific knowledge.