To analyze the relationship between the feature AST_BLOOD and the target task of chronic heart failure, we need to determine the appropriate ranges of values and identify typical AST_BLOOD values for each target class.

Since the feature AST_BLOOD represents Serum AsAT content, it is usually measured in IU/L (International Units per liter). To determine the appropriate ranges of values, we can consider the normal range for AST (Aspartate Aminotransferase) levels in blood, which is typically between 10 to 40 IU/L.

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

- If the AST_BLOOD values are within the normal range (10 to 40 IU/L), it is less likely to indicate chronic heart failure.
- If the AST_BLOOD values are significantly higher than the normal range (>40 IU/L), it may indicate a potential association with chronic heart failure.

Now, let's create a dictionary with typical AST_BLOOD values for each target class:

```json
{
	"no": [15.5, 21.9, 28.7, 35.2, 39.8],
	"yes": [44.6, 51.3, 58.9, 65.7, 72.4]
}
```
These AST_BLOOD values are just examples and may not represent actual data. They are included to illustrate the format of the dictionary and provide typical values for each target class.