To analyze the relationship between the feature AST_BLOOD and the presence of chronic heart failure, we need to consider the typical ranges of AST levels for individuals with and without chronic heart failure.

Based on prior knowledge, the typical range of AST levels for a healthy individual is 10-40 U/L. However, in the presence of chronic heart failure, AST levels can be elevated. To establish specific ranges, we will assume that AST levels above 50 U/L could indicate chronic heart failure.

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

```json
{
  "no": [20.0, 25.0, 28.0, 33.0, 38.0],
  "yes": [55.0, 60.0, 65.0, 70.0, 75.0]
}
```

In this example, we selected 5 typical AST_BLOOD values for each target class. The "no" class includes values within the typical range for healthy individuals (10-40 U/L), while the "yes" class includes values above 50 U/L, indicating the presence of chronic heart failure. Keep in mind that these values are for illustrative purposes and should be adjusted based on actual data and domain knowledge.