To analyze the relationship between the feature L_BLOOD and the target variable chronic heart failure, we need to consider the normal range of white blood cell count and how it relates to the presence or absence of chronic heart failure.

Typically, the normal range for white blood cell count is between 4.5 and 11 billion per liter. Higher values may indicate an infection or inflammatory response, while lower values may indicate bone marrow disorders or certain viral infections.

Based on this information, we can assume that higher values of L_BLOOD may be associated with the presence of chronic heart failure. Lower or normal values, on the other hand, may be associated with the absence of chronic heart failure.

Here is the dictionary with the possible values of L_BLOOD for each target class:

```json
{
    "no": [5.5, 6.2, 6.8, 7.1, 8.9],
    "yes": [9.5, 10.2, 10.8, 11.1, 12.9]
}
```

Please note that the values provided above are purely hypothetical and should not be considered as actual values for clinical diagnosis. The specific cutoffs for chronic heart failure may vary based on medical guidelines and patient characteristics, and should be determined by qualified medical professionals.