Change the type of function in the arduino iot cloud

Hello guys, I have some doubts about working with the dashboard in Arduino IoT Cloud. I would like to add a Switch button in the dashboard like the figure below.
dashboard
After adding the switch, arduino iot cloud will generate some code automatically in the sketch. As in below. However, It is a void function. I would like to use this switch to return some value to the main function. So it works like ....when I turn on the switch, it will return a value "1" to a variable in the main function. When it is turned off, it will return "0" to the variable in my main function.
auto generate sketch
I find it a bit challenging as the function has aldy been predefined in the thingProperties.h file. like below.


Is there any way I can change the type of the function(form void to int)? As I know the void type of function does not allow me to return a value to the main function. Any good suggestion or idea from you guys?