Based on prior knowledge, the ST_Slope feature can provide information about the presence of heart disease in a patient. Let's analyze the relationship between ST_Slope and the target variable using the given task. 

To do this, we will examine the possible values of the ST_Slope feature for both the "yes" and "no" classes of the target variable.

For the "no" class (no heart disease):
- ST_Slope can be "Flat" indicating a flat peak exercise ST segment.
- ST_Slope can also be "Down" indicating a downward sloping peak exercise ST segment.

For the "yes" class (heart disease):
- ST_Slope can be "Up" indicating an upward sloping peak exercise ST segment.

Based on this analysis, we can create the dictionary as follows:

```json
{
	"no": ["Flat", "Down"],
	"yes": ["Up"]
}
```