Based on prior knowledge, Oldpeak (ST depression induced by exercise relative to rest) is a numeric variable in coronary angiography that measures the depression in the ST segment. ST depression can be indicative of myocardial ischemia and potential heart disease. The relationship between Oldpeak and the presence of heart disease can be analyzed by comparing the Oldpeak values for patients with and without heart disease.

To create the dictionary, we need to identify typical Oldpeak values for both target classes, "no" (indicating no heart disease) and "yes" (indicating heart disease). Here, we assume that lower Oldpeak values typically indicate a lesser risk, while higher Oldpeak values indicate a higher risk.

The dictionary would then be structured as follows:

```json
{
	"no": [0.0, 0.2, 0.4, 0.6, 0.8],
	"yes": [1.0, 1.2, 1.4, 1.6, 1.8]
}
```

In this example, we have included five typical Oldpeak values for each target class. For the "no" class, indicative of no heart disease, the Oldpeak values range from 0.0 to 0.8. For the "yes" class, indicative of heart disease, the Oldpeak values range from 1.0 to 1.8.

Please note that the actual values and ranges would depend on the dataset and specific characteristics of the target variable and feature being analyzed. The values provided here are for illustrative purposes only.