Flair for automatic groups has been discussed before (https://meta.discourse.org/t/proposal-flair-on-avatar-for-trust-level/81250/5) and is something that will likely exist at some point in the future, but it isn’t a current priority.
The main reason is that automatic groups lack some of the features that manually created groups have:
If you’d like to add flair to a trust level, there is a theme component that can do it.
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