Collapse Subitems in Gantt

Would love to be able to collapse subitems in the Gantt chart view. Currently, only the Group can be collapsed and expanded in the Gantt view.

My use case is a high-level board where each pulse is a project, and the subitems are milestones of the project. With subitems collapsed, Gantt is a good overview of many projects on one timeline. Then it would be great to just expand milestones for the project of interest. Currently, I have a timeline for the projects and the dates for the milestones enabled for the Gantt view. It works well to show the milestones cascaded under the project, but it takes up a lot of vertical space because nothing can collapse.