Plugin outlets added per:
https://github.com/discourse/discourse/commit/6aea185ab4bc6f6dcfa77158f5d0e14a69abeeb8
This gives you 2 options:
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You can create a theme component that inserts a static bit of HTML you take care of updating by hand as you see fit.
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You can create a plugin that adds information to the serializer and injects the groups dynamically.