I'm following the doc (https://dev.office.com/reference/add-ins/excel/excel-add-ins-reference-overview) to build an Excel add-in. The add-in needs to populate an Excel table column with either dropdown or checkbox for the user to select actions to be done on the table row. I can't seem to find any API to insert a dropdown/checkbox in the Excel spreadsheet. Could someone advise how I could do that?