Undocumented vue-renderer:context hook

[mcrapts]

Is your feature request related to a problem? Please describe.

Nuxt exposes quite some hooks that can be used. They are document here: https://nuxtjs.org/docs/2.x/internals-glossary/internals-renderer#hooks. As far as I know none of these hooks give me the option to add content to only the ssrContext. Because of this I was wondering how the nuxt/content module works, and I noticed this module uses the vue-render:context hook, which is exactly what I needed for my use case. Why is this hook not documented? Can I use it safely?

The hook is used here: https://github.com/nuxt/content/blob/dev/packages/content/lib/index.js#L143

Describe the solution you'd like

Add documentation for the vue-render:context hook or a way to add content to only the ssrContext using other documented features.