kramdown/atlassian_document_format/hard_break.json

{
  "version": 1,
  "type": "doc",
  "content": [
    {
      "type": "paragraph",
      "content": [
        {
          "type": "text",
          "text": "This is a sample paragraph"
        },
        {
          "type": "hardBreak"
        },
        {
          "type": "text",
          "text": "with lorem ipsum dolor sit amet..."
        }
      ]
    }
  ]
}