Need help changing config for luci-app-statisitics

I'd like to change some of the configuration files for luci-app-statistics. I've found some of what I want to change in the /www/luci-static/resources/statistics/rrdtool/definitions directory.

I've made a couple changes to iptables.js in this directory. I've purses the luci cache files and restarted. I don't see that changes reflected when visiting the page. I'm missing something.

has anyone done this with any success?