#Raw

name.php

<?php

if( is_singular( array('product') ) ) {
    add_filter( 'wpseo_title', function($old) {
        $price = get_post_meta( get_the_ID(), '_regular_price', true);

        return $price;
    }, 100 );

    add_filter( 'wpseo_metadesc', function($old) {
        $price = get_post_meta( get_the_ID(), '_regular_price', true);

        return $price;
    }, 100 );

    add_filter( 'wpseo_metakey', function($old) {
        $price = get_post_meta( get_the_ID(), '_regular_price', true);

        return $price;
    }, 100 );
}