$meta_boxes[] = array(
    'id'         => 'C_meet_the_team',
    'title'      => '<img src="'.get_template_directory_uri().'/assets/metabox/img/academy-meet-the-team.png">',
    'post_types' => array( 'academy' ),
    'autosave'   => false,
    'context'    => 'normal',
    'priority'   => 'high',
    'revision'      => true,
    'storage_type'  => 'custom_table', // Important
    'table'         => "{$db_prefix}academies",  // Your custom table name
    'fields'     => array(
        array(
            'name' => 'Meet the team',
            'type' => "heading",
        ),
        // TEXT
        array(
            'name' => 'Title',
            'id' => "{$prefix}meet_the_team_title",
            'type' => 'text',
            'std' => 'Meet The [Academy] Team',
            'readonly'  => true,
        ),
        // GROUP
        array(
            'id'     => "{$prefix}meet_the_team_group",
            'type'   => 'group',
            'clone'  => true,
            'sort_clone' => true,
            'collapsible' => true,
            'group_title' => array('field' => "{$prefix}team_name" ),
            'add_button' => '+ Team Member',
            'fields' => array(
                // IMAGE
                array(
                    'name'             => 'Photo',
                    'id'               => "{$prefix}team_photo",
                    'type'             => 'image_upload',
                    'force_delete'     => true,
                    'max_file_uploads' => 1,
                    'max_file_size' => '2mb',
                    'max_status'       => true,
                    'image_size'       => 'thumbnail',
                ),
                // TEXT
                array(
                    'name' => 'Name',
                    'id' => "{$prefix}team_name",
                    'placeholder' => 'Name Surname',
                    'type' => 'text',
                ),
                // TEXTAREA
                array(
                    'name' => 'About',
                    'desc' => 'Short description',
                    'id'   => "{$prefix}team_about",
                    'type' => 'textarea',
                    'cols' => 20,
                    'rows' => 3,
                    'limit' => 140,
                    'limit_type' => 'character',
                ),
            ),
        ), // end Group
    ),
);