Based on prior knowledge, the RestingECG feature represents the results of a resting electrocardiogram. The categories are 'Normal', 'ST' (ST-T wave abnormality), and 'LVH' (Left ventricular hypertrophy).

To analyze the relationship between the RestingECG feature and the task of determining whether the coronary angiography shows a heart disease, we can consider the typical associations between the electrocardiogram results and heart diseases.

In general, a 'Normal' electrocardiogram result indicates a healthy heart, with no obvious abnormalities. However, it is important to note that a normal electrocardiogram does not rule out the possibility of a heart disease.

An 'ST' (ST-T wave abnormality) result suggests that there may be subtle changes in the electrical activity of the heart, which could be indicative of ischemia (reduced blood flow to the heart muscle) or other types of heart disease.

An 'LVH' (Left ventricular hypertrophy) result indicates an enlargement or thickening of the left ventricle of the heart. This can be a sign of conditions such as high blood pressure or heart valve problems.

To summarize the relationship between the RestingECG feature and the task:

- 'Normal' RestingECG results may be associated with a lower likelihood of heart disease, but do not definitively rule it out.
- 'ST' RestingECG results may suggest an increased likelihood of heart disease, particularly ischemia.
- 'LVH' RestingECG results may suggest an increased likelihood of heart disease, related to left ventricular hypertrophy.

Based on this analysis, the dictionary detailing the relationship between the RestingECG feature and the task is as follows:

```json
{
	"no": ["Normal"],
	"yes": ["ST", "LVH"]
}
```

Please note that the dictionary only includes the RestingECG values that are specifically associated with each target class.