def METHOD_NAME(frozen: SimpleNamespace) -> SimpleNamespace:
    """Add render_template method to frozen PhotoInfo object"""
    def render_template(template_str: str, options: RenderOptions | None = None):
        """Renders a template string for PhotoInfo instance using PhotoTemplate
        Args:
            template_str: a template string with fields to render
            options: a RenderOptions instance
        Returns:
            ([rendered_strings], [unmatched]): tuple of list of rendered strings and list of unmatched template values
        """
        options = options or RenderOptions()
        template = PhotoTemplate(frozen, exiftool_path=frozen._exiftool_path)
        return template.render(template_str, options)
    frozen.render_template = render_template
    return frozen