Based on my prior knowledge, I will analyze the relationship between the feature "L_BLOOD" (White blood cell count) and the task of determining whether the patient has chronic heart failure.

It is commonly known that an increased white blood cell count can indicate an inflammatory response or infection in the body. In the context of chronic heart failure, there can be underlying inflammatory processes that lead to an elevation in white blood cell count. However, it is important to note that there are various factors that can cause an increase in white blood cell count, and it may not always be directly related to chronic heart failure.

To analyze the relationship between "L_BLOOD" and the presence of chronic heart failure, I will examine the typical values of "L_BLOOD" for both target classes ("no" and "yes").

Based on this analysis, the dictionary will be as follows:

```json
{
	"no": [4.5, 5.1, 4.8, 5.2, 4.7],
	"yes": [5.8, 6.3, 6.1, 6.5, 5.9]
}
```
Please note that the values provided are merely hypothetical and should be replaced with actual values based on the data available.