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https://help.github.com/en/github/managing-your-work-on-github/opening-an-issue-from-code のように issue 作成を試そうとすると、 permalink というパラメーターがつくようなので、同様につければ良さそうかと思ったのですが、
https://help.github.com/en/github/managing-your-work-on-github/about-automation-for-issues-and-pull-requests-with-query-parameters
にはなかったので、 body に変更したコミットを積んでから pull request を作成しました。