Change the position of Aqara Roller Shade E1 based on the current positon?

Configuration Zigbee
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Hi everyone. New to HA, and started setting up my home recently. I have two Aqara Roller Shade E1 configured via zigbee2mqtt: Xiaomi ZNJLBL01LM control via MQTT | Zigbee2MQTT

Due to the unique design of my vertical blind, to tilt the bind, I need to change the position of E1 based on its current position state.

For example, if the current position of E1 is 50%, I need to change its position to 52% to tilt the blind, which is adding 2% to its current position. I want to run this change via automation when I click on a controller. It seems I need to publish MQTT message to change its position.

No problem in the trigger part, but any ideas on how to set the action part in this case? Have done some research, but no success in giving a correct position value when publishing MQTT message.

Thanks in advance.

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Did you manage to do this with the Aqara E1? I’m looking at the same issue, you can give it a position, but actually I want to step it forward or backward…