Based on prior knowledge, an abnormal ALT_BLOOD level can indicate liver damage or disease, which can be a potential contributing factor to chronic heart failure. To analyze the relationship between ALT_BLOOD and the presence of chronic heart failure, we need to compare ALT_BLOOD levels for patients with and without chronic heart failure.

Here is the dictionary with typical ALT_BLOOD values for each target class:

```json
{
    "no": [18.5, 20.3, 22.1, 23.9, 26.7],
    "yes": [27.6, 30.4, 32.2, 34.0, 36.8]
}
```

The values provided are just examples and should be replaced with actual values obtained from the dataset you're working with. These values represent typical ALT_BLOOD levels for patients without and with chronic heart failure, respectively.