Nexcloud Talk Android Client Encryption for text Chat

Nextcloud version 14.0.3
Talk 4.0.1
Nextcloud Talk Andoid 3.0.1

As far as I understood, the video and voice chat already use client end-to-end-encryption per default.
But how can I enable client end-to-end-encryption for the text message chat? Or is there no such feature?

In the Nextcloud Talk for Android settings you can specify a client certificate (“Client-Zertifikat einrichten”).
Is this required for the encryption?
If yes, is there any documentation on how to get such a certificate for Android?
Or is it used for something else?

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