Contact Form 7. Populate checkboxes field with ACF multiselect field

dynamic-populate-cf7.php

/**
* We need to add the data to the CF7 field shortcode.
* This example is with a data called 'datos-categorias'.
* The shortcode in CF7 will be something like
* [checkbox product-categories use_label_element  data:datos-categorias]
*/

add_filter( 'wpcf7_form_tag_data_option', 'fgrweb_populate_cf7', 10, 3 );

/**
 * Populate CF7 dynamic fields.
 *
 * @param  array  $n The data. Always null.
 * @param  array  $options The options.
 * @param  string $args The arguments. Always empty string.
 * @return array|null The populated categories or null if none.
 */
function fgrweb_populate_cf7( $n, $options, $args ) {
	// product categories in options.
	if ( in_array( 'datos-categorias', $options ) ) {
		$cat_checkboxes = array();
		$product_categ  = get_field( 'categorias_productos_formulario', 'option' );
		if ( ! empty( $product_categ ) ) {
			$options = array();
			foreach ( $product_categ as $categ ) {
				// get category name by id.
				$cat_name         = get_term_by( 'id', $categ, 'product_cat' )->name;
				$cat_checkboxes[] = $cat_name;
			}
		}
		return $cat_checkboxes;
	}
}