Based on prior knowledge, a relationship between the White blood cell count (L_BLOOD) and chronic heart failure can be analyzed. However, it is important to note that the specific ranges of values for L_BLOOD that indicate chronic heart failure would require domain expertise or further analysis.

Considering this, I will proceed with generating the dictionary with 5 typical L_BLOOD values for each target class:

```json
{
    "no": [5.2, 6.4, 6.8, 7.1, 7.5],
    "yes": [8.3, 8.7, 9.2, 9.8, 10.5]
}
```

Please note that the values provided above are for illustrative purposes only and should not be considered definitive or accurate without proper domain knowledge or analysis.