There's really not much more to it than the above code. You just put into your passage something like this:
<<set _data = { Name: $name, Date: _CurDate, Passage: _CurPassage }>>
<<run sendData()>>
where each of the properties (like "Name", "Date", etc...) match the columns in your Google Sheets page, and then the "<<run sendData()>>" line will upload the contents of the _data temporary variable to the Google Sheets page.
The toughest part is really setting up the Google Sheets page to accept the data and getting the correct URL for this to work.