A fake door test puts a button for a planned feature in your product and asks the people who select it what they need. This template takes under a minute: a welcome screen that says calendar sync isn't ready yet, a rating for how important it is, what it should include, and an offer of an email when it is ready.
It is written for a popup in your web app that opens when the button for the planned feature is selected. From Starter, or on 1 survey on Free, use an element click trigger on that button, or fire a custom event from your code. Replace calendar sync with your own feature on the welcome screen and in the questions.
Results shows the average importance with a bar per star and the share who rated it 4 or higher, the share asking for each part, and the share who want an email. People who say Yes leave their contact details, which Results lists in a table of names and emails.