To analyze the relationship between the feature L_BLOOD and the occurrence of chronic heart failure, we can refer to prior knowledge about the typical ranges of white blood cell count for patients with and without chronic heart failure.

Using my expertise, I can provide the following analysis:

1. For patients without chronic heart failure (no):
   - Typical L_BLOOD values may range from 4.0 to 9.0 billions per liter.
   - As an example, some possible L_BLOOD values could be: [4.5, 5.2, 6.1, 7.0, 8.3]

2. For patients with chronic heart failure (yes):
   - Typical L_BLOOD values may range from 7.0 to 15.0 billions per liter.
   - As an example, some possible L_BLOOD values could be: [7.2, 8.9, 10.1, 12.5, 14.7]

Based on this analysis, the dictionary with the required format would be:

```json
{
    "no": [4.5, 5.2, 6.1, 7.0, 8.3],
    "yes": [7.2, 8.9, 10.1, 12.5, 14.7]
}
```