How to add "End of Conversation" event handler to Universal bot

I have two standard bots, each configured with an “End of Conversation” event handler. Both standard bots are linked to a Universal bot. When using the Universal bot I don’t get the “End of Conversation” messages from the standard bots. How can I accomplish this?

End of Conversation event handler is currently unavailable for Universal Bot.

We are enhancing Universal bot and we are hopefully that this functionality will be in production tentatively by May or June 2020.