I understand this thread is old, but I wanted to give my idea since it worked well for me.
I wrote the story in Excel, and started a new line when there was a blank.
I created another tab where I would ask for a color, a size, an adjective etc.
I would type in their answers on this sheet.
back to the tab with the blank, I would reference the tab with their answers.
This worked well for me.
I got the content from a different user.