It is listed as a step in https://www.mediawiki.org/wiki/Manual:Adding_and_removing_languages#Right_to_left_languages but since T359761: Create a parser function to get the direction of a language or script we no longer need it.
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{{#dir:...}} incorrectly returns "ltr" for 75% of the language codes in Template:Dir. It's a long way from being a replacement for the template.
T359761 was marked as resolved without even doing what I asked for it to do.
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For translatewiki.net only, it also use override files like MessagesQqf.php to override rtl setting (see https://www.mediawiki.org/wiki/Manual:Adding_and_removing_languages#Right_to_left_languages). Of course the long-term solution is described in the first and third point of T359761#9810409.