WooCommerce Conditional Tag inside plugin

Thist function not working in product page

is_product_category()

So, for me the best options is first get the terms of the current post and the next step is get the name or slug, in this case i chose the category name

$product_cat_name = $term->name;

But you can chose the slug too (better option)

$product_cat_slug = $term->slug; 

Here the documentation
https://developer.wordpress.org/reference/functions/get_the_terms/

Example for Category name

/*Write here your own functions */
    add_action('woocommerce_before_add_to_cart_button', 'ddd_above_add_to_cart', 100);
    function ddd_above_add_to_cart() { 

            global $post;
            $terms = get_the_terms( $post->ID, 'product_cat' );
            $nterms = get_the_terms( $post->ID, 'product_tag'  );
            foreach ($terms  as $term  ) {
                $product_cat_id = $term->term_id;
                $product_cat_name = $term->name;
                break;
            }      
           //compare current category name == any category name you want
            if($product_cat_name =='vss' ) {
                echo "This Work";
            }           
    }

Example for Category Slug

/*Write here your own functions */
    add_action('woocommerce_before_add_to_cart_button', 'ddd_above_add_to_cart', 100);
    function ddd_above_add_to_cart() { 

            global $post;
            $terms = get_the_terms( $post->ID, 'product_cat' );
            $nterms = get_the_terms( $post->ID, 'product_tag'  );
            foreach ($terms  as $term  ) {
                $product_cat_id = $term->term_id;
                $product_cat_name = $term->name;
                $product_cat_slug = $term->slug;
                break;
            }      

            //compare current category slug == any category slug you want
            if($product_cat_slug =='any-slug-category' ) {
                echo "This Work";
            }           
    }