Based on the docs, there is a [convention](https://github.com/kubernetes/helm/blob/master/docs/chart_best_practices/conventions.md) to name charts with dashes. But at the same time based on this [doc](https://github.com/kubernetes/helm/blob/master/docs/chart_best_practices/values.md), you should never have values with dashes. So, let's say I have 2 dependent charts: `gitlab` and `gitlab-runner`. How can I configure and access values for the subchart?