Add own POIs to T & G Plus??

Counting the days until the delivery of a T4 Prius Plus (UK version) with NAV upgrade,

I use a Tomtom Sat Nav (GPS) for work which has literally thousands of our sites (electricity substations) stored as POIs as most of these do not have addresses.

Is it possible to add these POIs to the T & G Plus by using the locations/icons etc from the POI folder on the TT?

I can access the folder and was wondering (hoping) it was a case of plugging in a flash drive and the T & G "seeing" these new POIs.

Thanks,

Tim.