headless/test/data/structured_doc/figure_caption_expected.txt

{
   "lang": "en",
   "type": "Document",
   "~children": [ {
      "type": "Figure",
      "~children": [ {
         "alt": "Test image",
         "type": "Figure"
      }, {
         "type": "Caption",
         "~children": [ {
            "type": "NonStruct"
         } ]
      } ]
   } ]
}