When sharing the Gantt view as a webpage, the option to expand items (such as releases and epics) is unavailable to viewers. By allowing this functionality, the viewer could get a high level of understanding and expand items of interest to gain a deeper insight. The Gantt view is ideal because it takes little real estate to present much information compared to the custom roadmap feature, which takes up much more space and is comparatively visually unattractive.
This feature enhancement could be implemented as another option in the drill-down menu.
I appreciate your consideration!