The e-Niro can import your choice of Points of Interest (POI) files to the navigation system. I did this today with the collection of National Trust properties downloaded from https://www.poigraves.uk
As you will see there are various collections you can download, free of charge, along with...
I'm aware that Waitrose and the National Trust are extending their numbers of charging locations. The NT seems to have Wales well covered, but few in England so far.
Other than Motorway service stations are there others who offer easy to find locations where time may be usefully spent?