How to create html block to display extra information on woocommerce single product page

To begin with you may need to add %s to the sprintf function, as the current link has no anchor text and this is supposed to be put in by sprintf as the second argument:

return sprintf( '<div class="form-block block-after-indent"><a class="atbtn atbtn--secondary1" href="#sime_url_product_id_%d">%s</a></div>', $product->id, esc_html( $product->get_title() ) );

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