Based on the feature description, SVT_POST refers to the presence or absence of paroxysms of supraventricular tachycardia at the time of admission to the intensive care unit. To determine whether there is a relationship between this feature and the presence of chronic heart failure in a patient with myocardial infarction complications, we need to analyze the data.

Since SVT_POST is a categorical variable with categories 'no' and 'yes', we can compare the distribution of these categories among patients with and without chronic heart failure. 

Here is the expected dictionary:

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

In the target class of "no" (indicating no chronic heart failure), the only possible category for SVT_POST is "no". This suggests that when patients do not have chronic heart failure, they never have paroxysms of supraventricular tachycardia at the time of admission to the intensive care unit.

In the target class of "yes" (indicating chronic heart failure), both categories of SVT_POST ('no' and 'yes') are possible. This implies that some patients with chronic heart failure may have paroxysms of supraventricular tachycardia at the time of admission to the intensive care unit, while others may not.

It's important to note that the dictionary only includes the possible values for each target class and not all potential values of SVT_POST.