To analyze the relationship between the feature L_BLOOD (White blood cell count) and the task of determining whether the patient shows chronic heart failure, we can consider the ranges of white blood cell count values that are typically associated with chronic heart failure.

Typically, a normal range for white blood cell count is between 4 and 10 billion per liter. However, in the case of chronic heart failure, there may be an increase in white blood cell count.

Based on prior knowledge, we can assume that higher values of L_BLOOD might indicate chronic heart failure. For the purpose of creating the dictionary, let's consider the following ranges:

- for target class "no" (no chronic heart failure), possible L_BLOOD values could range from 4 to 7 billion per liter.
- for target class "yes" (chronic heart failure), possible L_BLOOD values could range from 7 to 15 billion per liter.

Using these ranges, we can generate the dictionary:

```json
{
    "no": [4.0, 4.5, 5.0, 6.5, 7.0],
    "yes": [7.5, 8.0, 10.0, 12.0, 15.0]
}
```

This dictionary represents 5 typical L_BLOOD values for each target class, where the values are presented as floats in lists.