using sass in ember.js addon

I am developing an addon in ember.js for my new ember app.

I am trying to figure out how to use sass as styles with my addon and make it independent from my app.

Saying that addon uses sass but the app using it dones't necessary has to have ember-cli-sass in its packages.json.

I've tried almost every solution that there is to be found on google, co I come here for the help :)

Lets say my addon name is awesome-tables, so if I put a css file in awesome-tables/addon/styles/addon.css the styles are concatenated into vendor.css as expected, but it doesn't work for sass / scss