Thank you for writing in! While that is outside the scope of support, I could point you in the right direction with the understanding that it would ultimately be your responsibility to take it from here.
First, please setup a child theme
Then login to your server (via FTP or cPanel's file manager) and navigate to this directory
Copy the file content-portfolio.php and paste that to your child theme in the same directory path
Open/edit the content-portfolio.php file, look for this block:
<?php x_portfolio_item_project_link(); ?>
<?php x_portfolio_item_tags(); ?>
<?php x_portfolio_item_social(); ?>
That is the extra info block (right sidebar) of the portfolio item page. You can replace or add the content of it.
You can add your own shortcode in there by using the do_shortcode() function.
Hope it helps,