Some tools will automatically ignore commits in a .git-blame-ignore-revs file. Git itself can "blame --ignore-rev <hash>" or "blame --ignore-revs-file <file>" since version 2.23.

  git commit -m "Autoformat source files"
  git log --format="# %s%n%H" -1 >> .git-blame-ignore-revs
  git add .git-blame-ignore-revs
  git commit -m "Ignore autoformat commit in blames"

  cat .git-blame-ignore-revs
  # Autoformat source files
  0a1b2c3d...

  git blame --ignore-revs-file .git-blame-ignore-revs code.src

Git can use it automatically too:

  git config blame.ignoreRevsFile .git-blame-ignore-revs
  git blame code.src

Though git-blame may fail or crash if blame.ignoreRevsFile is set but the file is missing (hence "config", not "config --global"). Since version 2.53, a configured ignoreRevsFile can be missing if the value starts with ":(optional)".

In GitHub and vim at least you can dig past those commits to see earlier relevant commits. I'm sure there are more tools that allow this.