Create a summary based on variables

Yes, that's possible. 

• Create a T/F variable associated with each "learn more" option. 
• Give each "Learn More" button a Normal and Selected state. The button will automatically toggle between those states when clicked. 
• Add a trigger that toggles the associated variable when the button is clicked.
• On the summary slide, include all of the options, with the Initial State as Hidden. 
• Use triggers with conditions to show the options based on whether the associated "Learn More" button was Selected. (For example: Show grilled-cheese when the timeline starts if variable GrilledCheese = True.) 

Note: Storyline doesn't have triggers that would compile a list with only the selected options. JavaScript can do that. Search the community, and you should find multiple posts about that.

This post has a demo file that you might find helpful: TIP: Track Responses to Custom Questions or Surveys | Articulate - Community 

And here are some links if you need to know more about variables and trigger conditions: 

• The Value of Variables | Articulate - Community 
• Storyline 360: Working with Triggers | Articulate - Community