Setting zigbee per-device attributes (aqara plug startup behaviour)

Hi, I got a few aqara wall plugs and could correctly integrate them using ZHA. I can also read the values of the individual devices.
Is the information on the values to use for the attributes available anywhere ?
I want to change the startup behaviour of the plugs so that they boot up under their previously known state after a power loss.
I found the value start_up_on_off (0x4003) but do not know which values to use…

Thanks !

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