Hi Tony,
Thanks so much for reaching out!
There isn’t a way to do this out of the box with our plugin alone, but you can try integrating a third-party plugin, like this one, in order to add a field at checkout instead.
You can also add this idea to our Feature Requests, as we tend to implement ideas based on customer feedback, so your input is greatly appreciated:
https://tribe.uservoice.com/forums/195723-feature-ideas
Let me know if you have any other questions on this topic!
Thanks,
Jaime