title: append data in csv, but determine the rows and columns yourself
body: <p>I want to ask, how do you append data in csv, but determine the rows and columns yourself? maybe someone has an example?
  <a href="https://i.stack.imgur.com/iH5Tn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iH5Tn.png" alt="enter image description here" /></a></p>