Based on prior knowledge, the ST_Slope feature represents the slope of the peak exercise ST segment. It is a categorical variable with three categories: 'Up', 'Flat', and 'Down'. To determine if the coronary angiography of a patient shows a heart disease, we can analyze the relationship between the ST_Slope feature and the target variable.

To create the dictionary, we need to identify the possible values of the ST_Slope feature for each target class ('yes' and 'no').

After analyzing the data, the dictionary will be as follows:

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

The 'no' class includes patients with 'Up' or 'Flat' ST_Slope, indicating that the coronary angiography does not show a heart disease. The 'yes' class includes patients with 'Down' ST_Slope, indicating that the coronary angiography does show a heart disease.