How to change/update CMB2 field in child theme

cmb2-override.php

<?php
/*****************************************************
==================PARENT THEME=========================
******************************************************/

/**
 * Suppose this is the function that contains the cmb2 metaboxes
 * in your parent theme. We want to change the name of the first
 * metabox from "Banner Text" to "Banner Content" and then change it's
 * type from "text" to "textarea"
 */
function my_cmb2_metaboxes( array $meta_boxes ) {

	// page metaboxes
	$meta_boxes['page_metaboxes'] = array(
		'id'           => 'page_metaboxes', // YOU NEED THIS ID TO HOOK. SEE BOTTOM COMMENT
		'title'        => 'Meta Options',
		'object_types' => array( 'page' ),
		'context'      => 'side',
		'priority'     => 'default',
		'show_names'   => true,
		'fields'       => array(
			array(
			    'name'    => 'Banner Text', // this will be changed in child theme
			    'id'      => '_page_banner_text',
			    'type'    => 'text', // this will be changed in child theme
			),
			array(
			    'name'    => 'Banner Image',
			    'id'      => '_page_banner_image',
			    'type'    => 'file',
			    'options' => array(
			        'url' => false,
			    ),
			),
		),
	);

	return $meta_boxes;
}
add_filter( 'cmb2_meta_boxes', 'my_cmb2_metaboxes' );

/*****************************************************
==================CHILD THEME=========================
******************************************************/

/**
 * This hook in child theme will change the cmb2 cofigured in parent theme
 */
add_action( 'cmb2_init_page_metaboxes', 'edited_cmb2_config', 10, 1 );
function edited_cmb2_config( $cmb2 ) {
	$cmb2->update_field_property( '_page_banner_text', 'name', 'Banner Content' );
	$cmb2->update_field_property( '_page_banner_text', 'type', 'textarea' );
}

/**
 * The tag for action hook depends on the metabox id. Since my id was "page_metaboxes"
 * that is why I use cmb2_init_page_metaboxes. Take a look at the end of the __constructor
 * of main CMB2 class in includes/CMB2.php in the cmb2 folder
 */