Analysis:

In order to analyze the relationship between the feature L_BLOOD and the task of determining if the patient shows chronic heart failure, we need to consider the normal range for white blood cell count and how it can be related to chronic heart failure.

White blood cell count is an important measure of the immune system's response to infections and inflammation. Generally, the normal range for white blood cell count is between 4,000 and 11,000 white blood cells per microliter of blood. Values below this range are considered low, while values above this range are considered high.

Chronic heart failure is a condition in which the heart is unable to pump blood efficiently. It can lead to fluid build-up in the lungs and other organs, resulting in symptoms such as shortness of breath, fatigue, and swelling in the extremities. White blood cell count can be elevated in inflammatory conditions, including heart failure.

Based on this information, we can analyze the relationship between L_BLOOD and chronic heart failure as follows:

- If the L_BLOOD value is within the normal range (4,000 - 11,000 white blood cells per microliter), it is less likely to indicate chronic heart failure.
- If the L_BLOOD value is below the normal range, it may suggest a decreased immune response, but it does not necessarily indicate chronic heart failure.
- If the L_BLOOD value is above the normal range, it may indicate an inflammatory response, which can be associated with chronic heart failure.

Dictionary:

Based on the analysis, the dictionary with specific details can be generated as follows:

```json
{
	"no": [6000.0, 7000.0, 8000.0, 9000.0, 10000.0],
	"yes": [12000.0, 13000.0, 14000.0, 15000.0, 16000.0]
}
```

Note: The values provided in the dictionary are just for illustration purposes and may not represent the actual values for each class. The values should be considered as typical examples within the appropriate range for each class.