Analysis:

To determine the relationship between the feature ALT_BLOOD and the presence of chronic heart failure, we need to consider the normal ranges for Serum AlAT content and its significance in relation to myocardial infarction complications.

Serum AlAT (Alanine Aminotransferase) is an enzyme primarily found in the liver cells. Elevated levels of ALT in the blood may indicate liver damage, which can be caused by various factors such as alcohol consumption, hepatitis, or drug toxicity. However, the relationship between Serum AlAT and chronic heart failure is not direct, and elevated ALT levels may not always correlate with the presence of heart failure.

In the context of myocardial infarction complications, the feature ALT_BLOOD may provide some insights into the overall health status of the patient. However, to determine whether chronic heart failure is present, additional tests and evaluation specific to the diagnosis of heart failure would be required.

Dictionary:

```json
{
	"no": [20.5, 22.7, 18.3, 23.1, 19.8],
	"yes": [25.6, 26.9, 24.2, 27.3, 25.1]
}
```

Please note that the ALT_BLOOD values provided above are arbitrary examples and should not be taken as definitive ranges or thresholds for determining chronic heart failure.