Based on the feature description provided, we need to analyze the relationship between the feature "IBS_POST" and the target variable "chronic heart failure". We are specifically interested in determining if the myocardial infarction complications data of the patient show chronic heart failure.

To analyze this relationship, we would need more information about the dataset and the overall context. However, based on the available information, we can make some assumptions:

1. If the feature value for "IBS_POST" is "there was no СHD", it is less likely to indicate chronic heart failure.

2. If the feature value for "IBS_POST" is "exertional angina pectoris" or "unstable angina pectoris", it is more likely to indicate chronic heart failure.

It is important to note that this analysis is based on limited information, and further exploration of the dataset and additional features would be necessary for a more accurate analysis.

Based on the information provided, the dictionary would look as follows:

```json
{
	"no": ["there was no СHD"],
	"yes": ["exertional angina pectoris", "unstable angina pectoris"]
}
```