Ignore specific changes but not the entire file

The problem with:

```sh git update-index [--skip-worktree|--assume-unchanged] ```

Is that it ignores the entire file.

Is there a plan to support something that remembers what was exactly ignored, and if there are changes to it, either un-ignore the file, or display the hunks that were changed?

Something like committing the change but not actually committing it.