wc-stock-status-shortcode.php

<?php

/**
 * add shortcode to wp
 */
add_shortcode( 'stock_status', 'display_product_stock_status' );
function display_product_stock_status( $atts) {
	$atts = shortcode_atts(
		array('id' => get_the_ID() ),
		$atts,
		'stock_status',
	);
	
	$product = wc_get_product( $atts['id'] );
	
	if ( ! $product ) {
		return null;
	}
	
	return wc_get_stock_html( $product );
}

// The code goes to your active theme (or child theme) functions.php

/**
 * Usage:
 * Place [stock_status id="YOUR PRODUCT ID"] everywhere you want to show stock status
 */