Automation: Sending Helper value through Call Service > mqtt

Hi, I have a value stored in a Helper name victron_acpowersetpoint that I edit through the front-end, and when it changes, the value need to be sent through MQTT. I tried the following, which is not working:

alias: Set AcPowerSetpoint
description: ''
trigger:
  - platform: state
    entity_id: input_select.victron_acpowersetpoint
condition: []
action:
  - service: mqtt.publish
    data:
      topic: input_select.victron_acpowersetpoint
      qos: '1'
      payload_template: '{{trigger.payload}},{{ input_select.victron_acpowersetpoint }}'
mode: single

Any advise?

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