We also want to add some governance on how tags are named and used but we find it problematic having to explain "the rules" outside of GrowthBook.
Maybe you could enable an advanced feature that allows admins to add an info icon ℹ️ with customisable text next to a section in a form (or just a little customisable description below the title of the section).
This way we could add a couple of lines on how to name Feature Keys or which tags to add for a Feature.
Will open an issue in GH if you prefer also
By the way, the fact that when hovering into a tag it shows the description is an amazing feature 💥