Unfortunately not, sorry about that. Our underwriters can only accept additional drivers that are your spouse, partner or other close family member.
Drivers with third party cover are welcome to drive your car (in an emergency) so they should check out their own cover to see if that is included. However, as the Miles Tracker needs to remain plugged in, you'll be charged for the miles they drive.
If you want to add a driver on a temporary basis, it might be easier and cheaper to use temporary cover instead.
There are many providers of temporary insurance if you need it. We can't make any recommendations, and you should do your own research to find the best policy. To help you on your way, you could look at Tempcover: https://www.tempcover.com/?refa=W68DJ773046