There’s no option to disable Chromatic aberration. Searching the support page for Chromatic aberration also yield no result.
Most people are fine with Chromatic aberration but for a few of the population that cannot stand it, its really really hampering the game experience.
https://www.google.com/search?q=chromatic+aberration+headache
For example, for me, i got a headache in just a few minutes of playing.
It would be a great accessibility boost if Halo Infinite have an option to disable Chromatic aberration. So those on PC can disable it without manually hacking the game, and those on xbox console can disable Chromatic aberration too.