Based on prior knowledge, ALT_BLOOD is a numeric variable representing the Serum AlAT content. To analyze the relationship between ALT_BLOOD and the presence of chronic heart failure as the target variable, we can look for potential ranges of values that are associated with each class.

Since we don't have specific data or predefined ranges, we can assume the following typical ALT_BLOOD values for each target class:

For the 'no' class (no chronic heart failure):
- ALT_BLOOD: [10.5, 12.3, 15.8, 17.2, 19.1]

For the 'yes' class (chronic heart failure):
- ALT_BLOOD: [23.6, 26.4, 28.9, 31.7, 35.2]

Based on this analysis, the dictionary representing the possible ALT_BLOOD values for each target class would be:

```json
{
	"no": [10.5, 12.3, 15.8, 17.2, 19.1],
	"yes": [23.6, 26.4, 28.9, 31.7, 35.2]
}
```