How to detect event-based activation support in Officejs

Question

Our add-in is using event-based activation (OnNewMessageCompose, OnMessageSend). Those events are not critical, therefore we use an unrestricted listing in AppSource. But we'd like to show an information inside the taskpane, if the add-in has been installed directly from AppSource by an user. So it's clear that event-based features of our add-ins won't work. Is there a way in Officejs to detect whether event-based activation is available or the add-in has been installed directly from AppSource by an user?