See project-level Gantt charts within a portfolio-level Gantt chart

The Gantt charts in the dashboards are great and very useful for high-level overview of project progress. When we have a list of active projects in a Gantt chart, it would be great to be able to click a button to expand each individual project to be able to see the project-level Gantt chart (including sub-tasks and timelines) whilst still in the portfolio-level Gantt chart.