Based on prior knowledge, the relationship between the AST_BLOOD feature and the presence of chronic heart failure can be analyzed by comparing the AST_BLOOD values in patients with and without chronic heart failure. 

Dictionary:
```json
{
	"no": [25.0, 30.0, 35.0, 40.0, 45.0],
	"yes": [50.0, 55.0, 60.0, 65.0, 70.0]
}
```
For patients without chronic heart failure (target class "no"), typical AST_BLOOD values could be [25.0, 30.0, 35.0, 40.0, 45.0].
For patients with chronic heart failure (target class "yes"), typical AST_BLOOD values could be [50.0, 55.0, 60.0, 65.0, 70.0].

Please note that these values are just examples and should be validated with actual data.