It should support the rules as documented in https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Robots-Tag
Additionally these rules can also be added:
X-Robots-Tag: noai, noimageai, SPC
You can have one or multiple active, some rules are just a value others are a name: value
pair.
By default it can just comma-separate the values, but feel free to make it opt-in to have 1 rule per header (and thus mutliple headers.
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