Based on my prior knowledge, the AST_BLOOD feature represents the Serum AsAT content in the patient's blood. To determine the appropriate ranges of values, we need to consider the reference range for AsAT levels in healthy individuals.

The normal range for AsAT levels is typically between 10 and 34 units per liter (U/L) for men and between 9 and 25 U/L for women. However, the specific ranges may vary slightly depending on the laboratory and the assay used.

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

Now, let's create the dictionary:

```json
{
	"no": [25.0, 28.5, 30.2, 32.1, 33.8],
	"yes": [35.7, 38.2, 40.9, 42.3, 45.6]
}
```

Note that these values are fictional and serve as examples. The actual values may vary depending on the dataset and analysis conducted.