The graphical roadmap allows you to add "Lanes" of work and time dividers too - both are completely flexible to suit any methodology.
If you are using an agile development methodology, you can use the lanes to show "Themes" of work or "Epics" and you can add items in Pendo Feedback as User Stories where you can define the story, add attachments and facilitate discussion.
Read more about setting up the graphical roadmap here.