IntelliJ SDK and callback to run configuration deletion

I'm writing a plugin for IntelliJ and I'm interested to know a way to get notified when a run configuration has been deleted. In the class RunConfigurationBase you have methods like onNewConfigurationCreated() and onConfigurationCopied(). It looks like class RunConfigurable.kt is in charge for the removal, but I don't see any way to notify a listener about the removal.

Any hint on how to proceed?