Yoast count text

<?php
add_filter( 'rwmb_meta_boxes', 'my_meta_boxes' );
function my_meta_boxes( $meta_boxes ) {
    $prefix = '';
    $meta_boxes[] = array(
        'title' => 'Yoast SEO Text Counter',
        'post_types' => 'post',
        'fields' => array(
            array(
                'id' => $prefix . 'sections',
                'type' => 'group',
                'clone' => true,
                'sort_clone' => true,
                'collapsible' => true,
                'fields' => array(
                    array(
                        'id' => $prefix . 'section_type',
                        'name' => esc_html__( 'Section Type', 'site' ),
                        'type' => 'select',
                        'options' => array(
                            'wysiwyg' => 'WYSIWYG Editor',
                            'image_grid' => 'Image Grid',
                            'quote' => 'Quote Section',
                            'form_id' => 'Gravity Forms ID'
                        )
                    ),
                    array(
                        'id' => $prefix . 'wysiwyg_section',
                        'name' => esc_html__( 'WYSIWYG Editor', 'site' ),
                        'type' => 'wysiwyg',
                        'visible' => array( $prefix . 'section_type', 'wysiwyg' ),
                        'add_to_wpseo_analysis' => true,
                        'clone' => true
                    ),
                    array(
                        'id' => $prefix . 'text_section',
                        'name' => esc_html__( 'Text', 'site' ),
                        'type' => 'text',
                        // 'visible' => array( $prefix . 'section_type', 'wysiwyg' ),
                        'add_to_wpseo_analysis' => true,
                    ),
                    array(
                        'id' => $prefix . 'image_section',
                        'name' => esc_html__( 'Image', 'site' ),
                        'type' => 'image',
                    ),
                    array(
                        'id' => $prefix . 'textarea_section',
                        'name' => esc_html__( 'Textarea', 'site' ),
                        'type' => 'textarea',
                        // 'visible' => array( $prefix . 'section_type', 'wysiwyg' ),
                        'add_to_wpseo_analysis' => true,
                    ),
                )
            )
        ),
    );
    return $meta_boxes;
}