They will just create/steal/borrow/bribe/underpay people who make styles and pretend the (a eye), did the thing then mix and match, tests to add variation and say look it learned... unless they have donated brains in some building underground or something, i doubt they can "generate/script/program" and (a eye) I wouldn't…
Your problem is on modelling side. I see same huge shading gradients on your mesh too. And while normal map can theoretically counter-measure them in a perfectly "synced" workflow you would never get it looking perfectly right in actual game anyway . 8 bit normal map with compression just doesn't have enough precision for…
Outside application and or plugin, probably best since some time has past to jot this issue down for a later date to review and look into for next time and just go ahead and manually do it, this is a good example of why planning ahead is important. Blender might help with this idk about blender to much though & jumping…