People/group fields in MS Bookings

I have a requirement where I’m considering MS Bookings, but the custom fields don’t seem to allow any validation. I want to have an admin team make bookings for health checks and specify the employee and line manager who the booking is for but I don’t want plain text for those fields, I need to look them up from AAD. This is because it’s a highly sensitive booking and there’s a danger they might misspell the address. Is this possible?