Create a new CSV file with row and column numbers from each cell

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This is really a completely different question. It would probably be better to ask a new one. That gives the new question greater visibility and doesn’t place the onus on someone who thought about this material a month or so ago.

Having said that, if you’re trying to create a download button for your end user, you should probably use d3.csvParse and pass that result to DOM.download. Assuming your data is a list of objects, that might look like so:

download_button =  {
  let text = d3.csvFormat(data);
  let file = new File([text], "file.csv");
  return DOM.download(file, "file.csv", "Download CSV file");
}

On the other hand, if you’re just trying to grab some data as a CSV out of your notebook, you could use the “Download CSV” option from the vertical three dot menu on the left hand side of the cell.