Possibility to repackage a chart or specify additional values/images in helm_install rules

[recons]

First of all, thank you for the great library! I want to use it in my project, but i'm not sure how to handle a case when I need to import a chart from repository and install it with additional values file and docker image dependency. More specifically, I want to import a bitnami kafka chart and provide additional initContainers and change heap opts. First possible workaround, which comes to my head, is to import a chart by http_archive rule and then package it with helm_package rule. Is there any way to do it better?