if ( ! function_exists( 'jh_child_custom_job_listing_structured_data' ) ) {
    function jh_child_custom_job_listing_structured_data( $data, $post ) {
        $salary = wp_get_object_terms( $post->ID, 'job_listing_salary', array( 'fields' => 'names' ) );
        if ( ! empty( $salary ) ) {
            $data['baseSalary']          = array();
            $data['baseSalary']['@type'] = 'MonetaryAmount';
            $data['baseSalary']['currency'] = 'USD'; // Replace USD with your Currency
            $data['baseSalary']['value'] = array(
                '@type'     => 'QuantitativeValue',
                'value'     => $salary[0],
                'unitText'  => 'MONTH', // Replace MONTH with your salary Period
            );
        }
        return $data;
    }
}
add_filter( 'wpjm_get_job_listing_structured_data', 'jh_child_custom_job_listing_structured_data', 10, 2 );