License Wrapping for DRM like Shaka Player

[aamir2007]

I would like to know who may I extend the flowplayer dashjs to add my own data into drm license request just like Shaka Player is allowing us to do in following way.
https://github.com/google/shaka-player/blob/master/docs/tutorials/license-wrapping.md

I want something like
player.extend("KeySystemWidevine", overrideKeySystemWidevine, true);
that dshjs allows to extended for license wrapping. this is what shaka player is using.