simple
.
.. subfigure:: AB

   .. image:: image.png
      :alt: hallo

   .. image:: image.png
      :alt: hallo
.
<document source="<src>/index.rst">
    <figure area_classes="" classes="sphinx-subfigure" grid_classes="" is_subfigure="True" layout="{'default': [['A', 'B']]}">
        <image alt="hallo" candidates="{'*': 'image.png'}" subfigure_area="A" uri="image.png">
        <image alt="hallo" candidates="{'*': 'image.png'}" subfigure_area="B" uri="image.png">
.
