Based on prior knowledge, AST_BLOOD is a measurement of Serum AsAT content. To determine the appropriate ranges of values, we need to consider normal levels of AST in the blood.

According to the American Association for Clinical Chemistry (AACC), the normal range for AST in adult males is typically less than 40 U/L, and for adult females is typically less than 32 U/L. However, it's important to note that these reference ranges can vary slightly depending on the laboratory and the specific testing method used.

To analyze the relationship between AST_BLOOD and the presence of chronic heart failure, we can compare the AST_BLOOD values for patients with and without chronic heart failure.

Here is a dictionary detailing the possible values of AST_BLOOD for each target class:

```json
{
	"no": [15.2, 19.5, 23.1, 28.4, 31.7],
	"yes": [39.6, 42.8, 44.3, 48.9, 51.2]
}
```

For the "no" class (patients without chronic heart failure), some possible AST_BLOOD values are 15.2, 19.5, 23.1, 28.4, and 31.7. These values are within the normal range for AST.

For the "yes" class (patients with chronic heart failure), some possible AST_BLOOD values are 39.6, 42.8, 44.3, 48.9, and 51.2. These values are higher than the normal range for AST, suggesting possible liver or heart damage.

Keep in mind that these values are just examples and not necessarily representative of the entire dataset. The actual values will depend on the specific dataset and the association between AST_BLOOD and chronic heart failure in that dataset.