I mean that I want to use Excel as a spreadsheet and use its contents to drive a D3 diagram without the current hassle of getting the data out of Excel into a f

I mean that I want to use Excel as a spreadsheet and use its contents to drive a D3 diagram without the current hassle of getting the data out of Excel into a format that D3 can read cleanly (and continuously - if I update the spreadsheet, the diagram should also update).