Sample function with ACF field loaded into WooCommerce single product hook

functions.php

<?php
	
	//Paste the content below into your your child theme's functions.php file
	//Do not past the <?php above
	//This is your function name
	function my_woo_custom_fields() {
		
		//this stops PHP, so we can work in HTML
		//replace text_field with your field
		?>
		
		<?php if( get_field('text_field') ): ?>
			<h2><?php the_field('text_field'); ?></h2>
		<?php endif; ?> 
		
		
		<?php
		//this starts PHP, so we can close the function
	}
	
	//This is the action to hook your function into the appropriate place in your single product template
	//The number changes the position relative to the other functions from WC hooked into this same hook
	
	add_action('woocommerce_single_product_summary','my_woo_custom_fields', 45);