Hello Andrew.Moses,
Thank you for your posting. Based on my experience, currently there’re only 2 types of custom field we can add to Bookings page: text question and dropdown question:
Add custom and required questions to the booking page
We can also add hyperlink to Business Information, but this way isn’t limited to specific service, it will take effect on entire Bookings page.
Except for adding custom field, I’m afraid there isn’t other way to add hyperlink to Bookings page. Sorry for the inconvenience. If you have further question and concern, please feel free to contact me. And if I misunderstood anything, please do not hesitate to correct me.
Best Regards,
Ette