Custom API using google sheet

Hi all, this is my first time posting on this forum. I am new to Voiceflow and trying to do my first VUI project in voiceflow. I am designing a recipe app. I successful retrieve a random recipe from a list of recipe on a google sheet, but then I want Alexa to display the corresponding ingredient list that user just selected on the screen (multi-modal). That’s where I am stuck. How can Alexa use the selected recipe and read out the correct corresponding ingredient list?