With the value "index=numbered" within the document class "scrbook" I changed the chapter head in this example from "MyIndex" to "2 MyIndex". In the pagehead
GitHub - Wandmalfarbe/pandoc-latex-template: A pandoc LaTeX
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Page Formatting
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r - MS Word number of pages in a flextable table using Rmarkdown
Headers and footers - Overleaf, Online LaTeX Editor
Page Formatting
header footer - Removing roman number after the title page - TeX
