No, this is not possible at the moment. However, it shouldn’t be very difficult to implement such a feature if your file has the same format as the original. The most cumbersome part is building a small user interface for the upload 
I keep mine in an amazon rds.
Thanks for doing this!
With the upcoming API changes on March 18 the script from Hitechbunny will probably stop working. The reason for this is that the original script used an API key scraper which won’t be supported anymore (see Upcoming API v2 Key Changes).
Since there seems to be no more activity from Hitechbunny, I updated the script and added a small API key input mask. After submitting a working API key, you need to reload the page to show the graph. Not fancy, but it works
You can find the script on Github Gists: https://gist.github.com/jhendess/c0c9795b1220ece0d4e8aa7bffad211a/raw/wk-dashboard-progress.user.js
If you use the script for a while and collected some historical data, it will sooner or later show a nice chart like this:
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