Based on prior knowledge, we can analyze the relationship between the feature SVT_POST and the task of determining if the patient has chronic heart failure.

From the given feature description, SVT_POST represents "Paroxysms of supraventricular tachycardia at the time of admission to the intensive care unit." It is a categorical variable with two possible categories: "no" and "yes."

To analyze the relationship, we need to examine how the SVT_POST values are distributed among the patients with and without chronic heart failure.

Here is an example dictionary representing the possible values of the SVT_POST feature for each target class:

```json
{
	"no": ["no", "yes"],
	"yes": ["no"]
}
```

Please note that this dictionary is just an example, and the actual relationship between SVT_POST and chronic heart failure would require analyzing the specific dataset.