I can add them for you. If you want, you can create a new user to me in your admin panel. In that way, I can modify the code on site. I have done this with other users and there were no problems. You can trust me. I only want fix this problem. You can send me the information to my email email@example.com
Depending on how you want to do this, after installation, we can create you an admin account so that the fields can be put in. Alternatively, you could put the fields in as a part of the customization work.