Based on prior knowledge, AST_BLOOD levels can be used to analyze the relationship between myocardial infarction complications and chronic heart failure. Below is a breakdown of the relationship between AST_BLOOD values and the target class of chronic heart failure (yes or no):

- For patients without chronic heart failure (target class "no"), typical AST_BLOOD values could include: 20.5, 25.3, 30.1, 32.7, 35.2.
- For patients with chronic heart failure (target class "yes"), typical AST_BLOOD values could include: 40.8, 43.6, 49.2, 55.9, 59.4.

Based on this analysis, here is the dictionary representation of the relationship between AST_BLOOD values and the target class for chronic heart failure:

```json
{
    "no": [20.5, 25.3, 30.1, 32.7, 35.2],
    "yes": [40.8, 43.6, 49.2, 55.9, 59.4]
}
```