Caldera Forms – Variable out of URL

How to parse a Variable out of an URL with Caldera Forms.

Scenario: https://domain.tld/form/?variable=foobar

Now Caldera Forms should grab the variable text foobar out of the URL and pre fill out the form with that variable.

How is that possible?

Settings -> Variable -> Name = variable, Value = {get:variable}, Behaviour = return

Settings -> Form -> Standard = {get:variable}

Now the variable is pre filled out from the url in the selected input field.