Not a great example, but ok. He was at about 1.6 ppg in juniors and in international. He was highly regarded, but he never dominated the way Hughes has. Others at 1.6 ppg range were Auston Matthews, Mikael Granlund, William Nylander and Teemu Pulkkinen.
The guys that accomplished 1.8 ppg in both domestic and international: Kucherov, Stamkos and Kuznetsov
Guys at 2.0 ppg in both: McDavid, Kane, and Hughes. That's it. Small club.
(keep in mind not all leagues/years are comparable, but interesting nonetheless)