Make columns for play descriptions

[darkhark]

One thing I've seen, specifically in https://github.com/maksimhorowitz/nflscrapR/blob/master/R/scrape_play_by_play.R, was the inclusion of specific play-by-play details as columns. A couple examples of this are run_location (left, middle, right) and pass_length(short, deep). The file I linked to shows how the description was parsed to retrieve the data.
I can parse the data myself, but I think it would be nice to be attainable through the API.