To analyze the relationship between the feature L_BLOOD and the task of chronic heart failure, we need to determine the appropriate ranges of values for L_BLOOD that indicate the presence or absence of chronic heart failure.

Typically, in a normal healthy adult, the white blood cell count ranges from 4,000 to 11,000 cells per microliter (or billions per liter). However, this reference range can vary depending on factors like age, sex, and overall health.

To analyze the relationship, we will consider the following assumptions:
- Values lower than the lower limit of the reference range (4,000 cells per microliter) might indicate a decreased white blood cell count.
- Values higher than the upper limit of the reference range (11,000 cells per microliter) might indicate an increased white blood cell count.

Based on these assumptions, we can create a dictionary with the feature values for each target class:

```json
{
    "no": [5000.0, 6000.0, 7000.0, 8000.0, 9000.0],
    "yes": [10000.0, 11000.0, 12000.0, 13000.0, 14000.0]
}
```

In this example, typical L_BLOOD values for the "no" target class include values within the normal reference range (e.g., 5000.0 to 9000.0). Typical L_BLOOD values for the "yes" target class include values above the upper limit of the reference range (e.g., 10000.0 to 14000.0).

Please note that these typical values are provided as examples, and you should adjust them based on actual data and domain knowledge if available.