To analyze the relationship between the feature AST_BLOOD and the presence of chronic heart failure (CHF), we can use our prior knowledge to determine the appropriate ranges of values for AST_BLOOD.

AST_BLOOD is a serum AsAT (Aspartate Aminotransferase) content, which is an enzyme found in various tissues including the heart and liver. Elevated levels of AsAT in the blood may indicate tissue damage or inflammation in these organs.

For the task of determining whether the patient shows chronic heart failure (CHF) based on myocardial infarction complications data, we can analyze the relationship between AST_BLOOD levels and CHF.

Here is a dictionary summarizing the possible values of AST_BLOOD for each target class ('no' and 'yes'):

```json
{
	"no": [25.0, 30.5, 35.2, 40.1, 45.7],
	"yes": [50.3, 55.8, 60.4, 65.2, 70.0]
}
```

Please note that the specific range of values for AST_BLOOD that determine the presence of CHF would depend on the underlying dataset and any relevant medical guidelines or research. The values provided above are hypothetical examples and should be interpreted as such.