Use WC Vendors Pro form helper to output a custom taxonomy checklist

functions.php

<?php 
// WC Vendors Pro 1.7.10 or above required. 


/** 
* Taxonomy: location. 
*/ 
function wcv_register_my_location_taxonomy() { 

	$labels = [ 
		'name' => __( 'Location', 'wcvendors-pro' ), 
		'singular_name' => __( 'location', 'wcvendors-pro' ), 
	]; 
	
	$args = [ 
		'label' => __( 'Location', 'wcvendors-pro' ), 
		'labels' => $labels, 
		'public' => true, 
		'publicly_queryable' => true, 
		'hierarchical' => true, 
		'show_ui' => true, 
		'show_in_menu' => true, 
		'show_in_nav_menus' => true, 
		'query_var' => true, 
		'rewrite' => [ 'slug' => 'location', 'with_front' => true, ], 
		'show_admin_column' => false, 
		'show_in_rest' => true, 
		'rest_base' => 'location', 
		'rest_controller_class' => 'WP_REST_Terms_Controller', 
		'show_in_quick_edit' => true, 
		'show_in_graphql' => false, 
		'capabilities' => [ 'assign_product_terms' ]
	]; 

	register_taxonomy( 'location', [ 'product' ], $args ); 
} 
add_action( 'init', 'wcv_register_my_location_taxonomy' ); 

// Output the location checklist 
function form_location( $object_id ) { 
	
	$args = array(
		'taxonomy' => 'location',
	);

	$field = array(
		'id'    => 'product_loc_list',
		'label' => __( 'Location', 'wcvendors-pro' ),
		'class' => 'product_cat_checklist',
	);

	WCVendors_Pro_Form_Helper::wcv_terms_checklist( $object_id, $args, $field );

} 
add_action( 'wcv_after_product_details', 'form_location' );

// Save the terms 
function save_location( $post_id ){ 
	if ( isset(  $_POST[ 'location' ] ) && is_array( $_POST[ 'location' ] ) ) { 
		$location = array_map( 'intval', $_POST[ 'location' ] ); 
		$location = array_unique( $location ); 
		wp_set_post_terms( $post_id, $location, 'location' ); 
	} 
} 
add_action( 'wcv_save_product', 'save_location' );