Modifing service field with msg.payload in call service node

I would like to be able to change the state on my input.boolean to turn_on or to turn_off by changing the msg.payload that would somehow change de code in the data field. Why is this not working :{input_boolean.turn_on}. I need help understanding how to formulate the writing in this data field.

Screenshot 2020-11-11 144641

Thank you!

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THANK YOU, your help is very appreciated!