Summary bot for Nextcloud Talk Calls

Does anyone know how to setup the summary bot for Nextcloud Talk Calls ?

I have set up the OpenAI App, enabled AppAPI & the Summary Bot is running and can also summarise chat (text) conversations. But when I call the bot with @summary after a call (voice), the bot only summarizes the participant entries & exits.

In a Hub 9 demo they showed an AI summarizing a call, but I could not find any documentation about that.

Cheers
Simon