How to add a text caption to an image with OpenOffice::OODoc?

I have the following code that creates an odf-document with a heading and a picture:

#!/usr/bin/perl 

use strict;
use warnings;
use OpenOffice::OODoc;

my $doc = odfDocument(
    file   => 'test.odt',
    create => 'text'
);

my $head = $doc->appendHeading(
    text  => "This is a Test",
    style => 'Heading 1'
);

my $style = $doc->createImageStyle("Photo");
my $image = $doc->createImageElement(
    'some picture',
    style      => 'Photo',
    attachment => $head,
    size       => '4cm, 12cm',
    link       => '/full/path/to/picture.png'
);

$doc->save();

How can I add a text caption to the picture? When I create a text caption in LibreOffice the part of the 'content.xml' where a caption is created looks like this.

<draw:frame draw:style-name="fr1" draw:name="Frame1" text:anchor-type="as-char" svg:y="0cm" svg:width="4.001cm" draw:z-index="0">
  <draw:text-box fo:min-height="12cm">
    <text:p text:style-name="Caption">
      <draw:frame draw:style-name="fr2" draw:name="Eiffel Tower" text:anchor-type="paragraph" svg:x="0.004cm" svg:y="0.002cm" svg:width="4.001cm" style:rel-width="100%" svg:height="12cm" style:rel-height="scale" draw:z-index="1">
        <draw:image xlink:href="full/path/to/picture.png" xlink:type="simple" xlink:show="embed" xlink:actuate="onLoad"/>
      </draw:frame>
      test caption
    </text:p>
  </draw:text-box>
</draw:frame>

I think it creates a frame and then puts the image and the caption text inside of it. I am lost at this point. I couldn't find something about adding elements to frames in the documentation either.

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