Based on prior knowledge, Oldpeak is a numeric variable measured in depression. In the context of coronary angiography, Oldpeak refers to the ST segment depression, which is a measure of heart muscle ischemia during exercise. Since the task is to determine whether the coronary angiography shows a heart disease, we can analyze the relationship between Oldpeak and the target variable.

To create the dictionary, we need to identify possible values of Oldpeak for both target classes ('no' and 'yes'). Here are some typical Oldpeak values for each target class:

```json
{
    "no": [0.0, 0.5, 1.0, 1.5, 2.0],
    "yes": [0.5, 1.0, 1.5, 2.0, 2.5]
}
```

In this case, we assumed that "no" represents absence of heart disease and "yes" represents presence of heart disease. The dictionary provides a list of typical Oldpeak values for each target class.