I have been able to manipulate the URL using:
<?php $share_url = get_permalink().'job/'.$bb_job->id.'/';
echo str_replace('https://www.mywebsite.com/job-search/', $share_url, sharing_display());
?>
When I view the page and look at the code the URL is correct however when I click on a share button the URL is still https://www.mywebsite.com/job-search/ without the extra bit refering to the job.