Remove offers from structured data for Variable Products

functions.php

<?php
add_action( 'woocommerce_structured_data_product', 'studiowp_woocommerce_structured_data_product', 10, 2 );
function studiowp_woocommerce_structured_data_product( $markup, $product ) {
    if ( $product->is_type('variable') ) {
	    unset( $markup['offers'] );
    }
    return $markup;
}