I'm working on a small application that trains users to navigate around cells and enter predefined (placeholder) content.
I know that it's possible to add per-column placeholders but haven't found a way to add per-cell placeholders.
Is there any way?
Try adding the placeholder to the cellProperties instead of the Column. I guess it should work. The cascading configuration should pick up the cell properties. https://github.com/handsontable/handsontable/wiki/Options#how-does-cascading-configuration-work