How can I set a sleep mode schedule?

In the battery section of the settings, there is an option to set a sleep mode schedule (in German Akku / Energiesparmodus / Zeitplan festlegen). But there is no option to create such a schedule, e.g. “start at 10:00 pm, stop at 8:00 am”. I can only set a battery status to start or end sleep mode.
Is this a bug, or is there something I can’t see?
Heinz
(using stock rom with latest updates)

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