Display custom field contents woocommerce

I have added a custom field in woocommerce backend to choose products using the following code (in functions.php)

// Display the custom fields in the "Linked Products" section
add_action( 'woocommerce_product_options_related', 'woocom_linked_products_data_custom_field' );

// Save to custom fields
add_action( 'woocommerce_process_product_meta', 'woocom_linked_products_data_custom_field_save' );

// Function to generate the custom fields
function woocom_linked_products_data_custom_field() {
    global $woocommerce, $post;
?>
    <p class="form-field">
        <label for="inkt_products"><?php _e( 'Inkten', 'woocommerce' ); ?></label>
        <select class="wc-product-search" multiple="multiple" style="width: 50%;" id="inkt_products" name="inkt_products[]" data-placeholder="<?php esc_attr_e( 'Search for a product&hellip;', 'woocommerce' ); ?>" data-action="woocommerce_json_search_products_and_variations" data-exclude="<?php echo intval( $post->ID ); ?>">
        <?php
            $product_ids = get_post_meta( $post->ID, '_inkt_products_ids', true );

            foreach ( $product_ids as $product_id ) {
                $product = wc_get_product( $product_id );
                if ( is_object( $product ) ) {
                    echo '<option value="' . esc_attr( $product_id ) . '"' . selected( true, true, false ) . '>' . wp_kses_post( $product->get_formatted_name() ) . '</option>';
                }
            }
        ?>
    </select>
        <?php echo wc_help_tip( __( 'Select Products Here.', 'woocommerce' ) ); ?>
    </p>

    <p class="form-field">
        <label for="papier_products"><?php _e( 'Papier', 'woocommerce' ); ?></label>
        <select class="wc-product-search" multiple="multiple" style="width: 50%;" id="papier_products" name="papier_products[]" data-placeholder="<?php esc_attr_e( 'Search for a product&hellip;', 'woocommerce' ); ?>" data-action="woocommerce_json_search_products_and_variations" data-exclude="<?php echo intval( $post->ID ); ?>">
        <?php
            $product_ids = get_post_meta( $post->ID, '_papier_products_ids', true );

            foreach ( $product_ids as $product_id ) {
                $product = wc_get_product( $product_id );
                if ( is_object( $product ) ) {
                    echo '<option value="' . esc_attr( $product_id ) . '"' . selected( true, true, false ) . '>' . wp_kses_post( $product->get_formatted_name() ) . '</option>';
                }
            }
        ?>
    </select>
        <?php echo wc_help_tip( __( 'Select Products Here.', 'woocommerce' ) ); ?>
    </p>

    <?php
}

// Function the save the custom fields
function woocom_linked_products_data_custom_field_save( $post_id ){
    $product_field_type =  $_POST['inkt_products'];
    update_post_meta( $post_id, '_inkt_products_ids', $product_field_type );
    $product_field_type = $_POST['papier_products']; 
    update_post_meta( $post_id, '_papier_products_ids', $product_field_type );
}

I want to display this in the product page. I tried
get_post_meta( $post->ID, '_inkt_products_ids', true );

But that doesnt work. How can I show the ids/products?