Add 'Product Type' column in User Dashboard > My Listings.

functions.php

<?php

add_filter( 'job_manager_job_dashboard_columns', function( $columns ) {
    $columns['product_type'] = 'Product Type';
    return $columns;
} );

add_action( 'job_manager_job_dashboard_column_product_type', function( $listing ) {
    if ( ! $listing->_package_id || ! ( $product = wc_get_product( $listing->_package_id ) ) ) {
        return false;
    }

    echo $product->get_name();
} );