LearnDash scoring modification.

I have a LearnDash site where you can automatically score essay questions (they're graded by the fact that they're done at all), but I'd like to make it so that the automatic scoring only gives them a passing grade on the essay if it has minimum amount of words (that I can configure in the code). It would probably be pretty easy once you found the appropriate file, though this would need done in the child theme or a separate plugin so that the changes don't get overwritten with future updates.

If this is something you can handle, please use only my first name "Tim" in your bid so that I know you read this.