I tried using the {{conversation.SummaryAgent.summary}} to output the fill conversation of my flow, it missed returning responses that were displayed as dropdowns.
Here's a sample:
'Your conversation summary: Hi there! Are you looking to Buy, Sell or Rent a property? What type of property are you interested in? Do you prefer a new construction or existing homes? Please provide a rough estimate. $1.5m-$1.6m.
It did return one dropdown response though for price.