add_filter('site-reviews/review/wrap/content', function ($html, $value, $tag) {
    // Change 462 to your Review Theme Post ID
    if (462 !== $tag->args->theme) {
        return $html;
    }
    // The Post ID of the first assigned post (because reviews can be assigned to multiple posts)
    $postId = $tag->review->assigned_posts[0] ?? 0;
    // Use the Post ID to get your meta data values
    // Here is an example of how to modify the HTML of the content tag:
    $imageUrl = 'https://i.pinimg.com/736x/58/bd/4f/58bd4fc9ebfccc1f2de419529bbf1a12.jpg';
    return '<div>'.
        sprintf('<img src="%s" width="75" style="float:left; margin:0 1em 1em 0;" />', $imageUrl).
        $html.
    '</div>';
}, 10, 3);