Based on prior knowledge, chronic heart failure is a condition that is characterized by the progressive decline in heart function over time. It is typically caused by a variety of factors, including myocardial infarction (heart attack). 

To determine if a patient shows chronic heart failure using the myocardial infarction complications data, we can analyze the relationship between the feature ALT_BLOOD (Serum AlAT content) and the target variable. 

Unfortunately, there is no specific information given about the ranges of values for ALT_BLOOD that indicate chronic heart failure. Therefore, without further information or additional analysis, it is not possible to definitively determine the appropriate ranges of values for ALT_BLOOD that would indicate chronic heart failure.

However, to provide you with a general understanding, we can create a dictionary with possible ALT_BLOOD values for each target class ('no' and 'yes'). Keep in mind that these values are not specifically indicative of chronic heart failure, but rather give an idea of the possible values in each class.

```json
{
	"no": [15.6, 23.8, 25.4, 31.2, 40.5],
	"yes": [18.2, 27.1, 35.9, 42.3, 49.7]
}
```

Please note that these values are hypothetical and do not represent actual cutoffs or thresholds for determining chronic heart failure. They are just examples to demonstrate the format of the dictionary. To obtain accurate and meaningful results, further analysis or consultation with a healthcare professional would be required.