Can't answer your question directly, but coincidentally I was perusing 2021 Colorado diesel specs. Their front shocks offer a 1" lift. This might or might not be a new offering, but you could check your local Chev/GM parts dept. and see if they offer what you want OEM.
Now to thread hijack. Who has raised their diesel front ends 1", and how has it been? Especially interested in those who lifted, and subsequently towed heavy. I know it's available with Bilstein struts, which I might have installed this spring. I am super conservative on mods, but 1" higher in front would be nice. Compromised handling, a harsher ride, more tire wear, not so much...
As LA said, thanks in advance.