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This is new in https://peps.python.org/pep-0750/
It probably isn't worth looking at until Python 3.14 is out (just to avoid wasting effort on last minute removals). Based on a quick skim, it may not be too complicated - the syntax is mostly covered by f-strings and most of the implementation is in the Template class that Python provides (although that does mean we can't provide a back-ported implementation).