Here's the function you can use:

function createString(startRow, endRow, startCol, endCol) {
  let result = '';
  for (let i = startRow; i <= endRow; i++) {
    let coords = String.fromCharCode(startCol + 64) + i + ':' + String.fromCharCode(endCol + 64) + i;
    if (i !== startRow) {
      result += ', ';
    }
    result += coords;
  }
  return result;
}
When you call this function with the starting row, ending row, starting column, and ending column as parameters, it will return a string formatted like 'A6:B6, A7:B7, A8:B8'.

For example, if you want to create a string for rows 6 to 8 and columns A to B, you can call the function like this:

createString(6, 8, 1, 2);

This will return the string 'A6:B6, A7:B7, A8:B8'.

I hope this helps! Let me know if you have any other questions.
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