Dream is an Aeroghaiai .... but they're €350 and unobtainium currently.
The only Chinese aero gravel bar that I've seen is one with an integrated stem. The new LightCarbon HBR08, which just came on the market. Minimum is 90mm stem and I've also just bought an 80mm stem. Reach and drop of the bar are relatively high by modern standards (82 /125). Still, better than anything else I'm aware of.
Loads of other 3T style bars on the market, but nothing like the Aeroghaiai or even the Superghaiai.
Why aero on gravel? Because deep, flat parts at 3 and 6 o'clock are way more comfortable if you have big hands. After fitting the aero bullhorns on my track / city bike, I now hate skinny circular drop bars .... they feel uncomfortable and strange
P.S. I gave up on the aerowave style bars due to being unsure about quality, and also some flare may be wise if I'm to travel with the bike - potentially to somewhere more gnarly and rolling than the Amsterdam area