$meta_boxes[] = [
        'title'  => esc_html__( 'Video & Quote Testimonials - Section I', 'lhk' ),
        'post_types' =>   [
         'page',
        ],
        'context' => 'after_title',
        'priority' => 'default',
        'autosave' => false,
        'include' =>   [
          'relation' => 'AND',
          'template' =>     [
            'templates/template-testimonials.php',
          ],
    ],
    'fields' => [
                [
                    'id'     => 'group_default_video',
                    'type'   => 'group',
                    'clone'  => true,
                    'sort_clone' => true,
                    'collapsible' => true,
                    'group_title' => esc_html__( 'Video Testimonial', 'lhk' ), // ID of the subfield
                    'save_state' => true,
                    'fields' => [
                        [
                            'id' => 'default_title',
                            'type' => 'text',
                            'name' => esc_html__('Video Title', 'lhk'),
                            'desc' => esc_html__('Please insert your text.','lhk'),
                            'size' => 85,
                        ],
                       [
                            'id' => 'default_url',
                            'type' => 'url',
                            'name' => esc_html__('Video URL', 'lhk'),
                            'desc' => esc_html__('Please insert video url address','lhk'),
                            'size' => 85,
                       ],
                    ],
                ],
                [
                    'id'     => 'group_default_quote',
                    'type'   => 'group',
                    'clone'  => true,
                    'sort_clone' => true,
                    'collapsible' => true,
                    'group_title' => esc_html__( 'Quote Testimonial', 'lhk' ), // ID of the subfield
                    'save_state' => true,
                    'fields' => [
                        [
                            'id' => 'default_text',
                            'type' => 'textarea',
                            'name' => esc_html__('Quote Text', 'lhk'),
                            'desc' => esc_html__('Please insert your text.','lhk'),
                            'cols' => 50,
                            'rows' => 3,
                        ],
                        [
                            'id' => 'default_author',
                            'type' => 'text',
                            'name' => esc_html__('Author', 'lhk'),
                            'desc' => esc_html__('Please insert your text.','lhk'),
                            'size' => 65,
                        ],
                         [
                            'id' => 'default_company',
                            'type' => 'text',
                            'name' => esc_html__('Company', 'lhk'),
                            'desc' => esc_html__('Please insert your text.','lhk'),
                            'size' => 85,
                        ],
                       [
                            'id' => 'default_image',
                            'type' => 'single_image',
                            'name' => esc_html__('Logo/Image', 'lhk'),
                            'desc' => esc_html__('Please upload the image.','lhk'),
                       ],

                ],

        ],

    ],
    'validation' => [
        'rules' => [
            'default_url' => [
                 'url' => true,
            ],

        ],
    ],
    'message' => [
        'default_url' => [
            'url' => 'Valid URL required',
        ],

    ],

];