Changing it to
Type number : occupancy_timeout "Timeout wenn keine Bewegung" [commandTopic="zigbee2mqtt/bridge/request/device/options", formatBeforePublish="{\"id\":\"0x70ac08fffe9ca116\",\"options\":{\"occupancy_timeout\":%s}}"]
worked finally.
Theres been a request for ZigBee2MQTT. And a little “tutorial” in the answers.
https://github.com/Koenkk/zigbee2mqtt/issues/1132