There are some certain issues with converting layouts into spreadsheet cords. Anchors bound to columns and rows will resize connected components (text) when column/row change its size due to later components rendering.
Mapping pixel/inch/point to ordinal row/column is not easy as different methods for resolving target row/column exist. We may round pixel value down or half up, we may truncate pixel value (floor) or we may use next column/row (ceiling) when resolving anchor size. All depends on use case thus introduces lot of complexity.