Insert variable in Google sheet

I would like to insert variables into a google sheet from within an articulate storyline course.

- user submits 1 or 2 variables
- these variables are to be inserted into an invisible google sheet in the background without bothering the user
- (the same variables will be used later on in the same course)

I know how to insert a webobject 'google sheet' and not to show it to users.
I don't know how to insert the variables into the google sheet

Maybe instead of a sheet a google form could be used, but then I would have to fill the form fields with the storyline variables and perform a submit.

Anyone done this?