Just load your image and hit Queue Prompt

the workflow will detect and make a mask for the chin. I will also remove the lips from the mask

then using my https://civarchive.com/models/775002/chin-fixer-2000 LoRA it will inpaint just the chin

run again if you hit a bad seed

If you want to change something else like the Nose
just change out "chin, cleft chin, jawbone, bottom of head " with
"nose"
in the "What we are fixing" node