Are we gonna get more EU plates in addition to the 2 we have now? What we have: Italy(I), Germany(D) What we don’t have: France(F), Norway(N), Sweden(S), Ireland(IRL), etc. To start, I think you should do the countries on the European mainland.
The reason why tis just those 2 its because there's a map based around those 2 countries already. If there's more european locations planned they will add more.
https://www.beamng.com/resources/european-license-plates-compilation.6952/ https://www.beamng.com/resources/polish-license-plates-pack.6935/ Also an old one fit to US plate dimensions: https://www.beamng.com/resources/french-license-plate.854/