flatsome_product_detail_page_text_after_excerpt.php

<?php

//flatsome product detail page text after excerpt

function display_after_short_description($excerpt) {
        
        $add_to_excerpt = $excerpt . "<p style='color:green'>Add anything after excerpt</p>";  
        
        return $add_to_excerpt;
    }
    
    add_filter('woocommerce_short_description', 'display_after_short_description');