here's how to handle column support

[souvikinator]

here's how to handle column support

[emilemoureau]

Improved version with responsive css and support of titles + paragraphs + images in each column (exactly like Notion)

n2m.setCustomTransformer("column_list", async (block) => {
  const mdBlocks_temp = await n2m.pageToMarkdown(block.id);
  let final_md_string = `<div className="column" style={{ display: "flex", columnGap: "25px" }}>`;

  for (const one_block of mdBlocks_temp) {
    const mdString_temp = n2m.toMarkdownString(one_block.children);
    final_md_string = final_md_string + `<div>${mdString_temp}</div>`
  }

  return final_md_string + "</div>"
});

.column div {
  display: flex;
  justify-content: center;
  flex-direction: column;
}

@media screen and (max-width: 630px) {
  .column {
    flex-direction: column;
  }
}

[souvikinator]

Thanks for sharing, I marked it as information and won't close this issue for future reference.