Excel for Windows has supported adding Shapes inside (not over) Charts for many years. Excel Online does not (if a Chart contains Shapes, they will not be displayed) Would it be possible to support...
My team also needs this feature. We want to insert shapes directly inside a chart to make them a part of the chart object (see our idea posted here: Inserting/ grouping textboxes with Excel charts). This functionality is essential for us to modernize our Excel VBA add-in to Office.js.