Allow multiple record types to display in initiative and custom roadmaps

As a portfolio or product manager, my investment initiatives may require work from multiple workspaces. These workspaces may be different types of products or teams whose work is managed differently, so the work they do to support my initiative may be a workspace initiative, epic, or feature.

I need to be able to visualize my initiative as a gantt, and show its child records, regardless of type or origin workspace, as work beneath my initiative.

I need the viewers of this report to be able to expand/collapse these children.