you can access the selected option of a select widget like so:
var sumDropdowns = awareness.selectedOptionValue + consideration.selectedOptionValue + conversion.selectedOptionValue + kernbotschaft.selectedOptionValue
I’m assuming here that your widgets are named as
awareness
consideration
conversion
kernbotschaft
This is how you would use it in a JS object.
If you’d like to use it in the canvas itself, suppose you have a text widget where you want to show the sum, you can use the moustache syntax.
Example: