To analyze the relationship between the feature ALT_BLOOD and the presence of chronic heart failure (target variable), we need to take into account the typical ranges of ALT_BLOOD values for each target class. Since the feature ALT_BLOOD represents the Serum AlAT content, we can rely on medical knowledge to determine the appropriate ranges.

Typically, ALT_BLOOD values within certain ranges can be indicative of chronic heart failure. However, it is important to note that this analysis is based on general knowledge and cannot be considered a definitive diagnosis.

Here is an example of how the dictionary for the given feature and task could be created:

```json
{
	"no": [10.2, 11.5, 9.8, 13.4, 12.1],
	"yes": [18.7, 17.9, 21.3, 19.6, 15.2]
}
```

Again, please note that these values are for illustrative purposes only and should not be used as a substitute for a proper medical diagnosis.