Based on prior knowledge, I will analyze the relationship between the feature L_BLOOD (White blood cell count) and the task of determining chronic heart failure complications after myocardial infarction.

Analysis:

Chronic heart failure is often associated with inflammation and immune system activation, which can be reflected in the white blood cell count. Typically, a normal white blood cell count ranges from 4.5 to 11 billion per liter in adults. However, in the context of myocardial infarction complications and chronic heart failure, specific ranges might differ.

To conduct a thorough analysis, I will examine the range of L_BLOOD values for patients with and without chronic heart failure complications.

Dictionary:

```json
{
	"no": [5.8, 6.2, 4.9, 7.3, 5.5], 
	"yes": [9.6, 10.1, 7.9, 8.5, 9.2]
}
```

Please note that these values are just examples and may vary depending on the specific dataset or domain knowledge.