How to insert two separate bibliographies (without citing them in the body text) under two separate headers in R Markdown?

Consider the following R Markdown code:

---
title: 'John Doe'
output: pdf_document
bibliography: [bib1.bib, bib2.bib]
nocite: '@*'
csl: vancouver.csl
---

# Peer-reviewed publications

# Other publications

bib1.bib code:

@article{article1,
Author = {Doe, John},
Title = {{Article 1 name}},
Journal = {{Journal 1 name}},
Year = {{2021}},
Volume = {{1}},
Pages = {{1-2}},
}

@article{article2,
Author = {Doe, John},
Title = {{Article 2 name}},
Journal = {{Journal 2 name}},
Year = {{2020}},
Volume = {{1}},
Pages = {{1-2}},
}

bib2.bib code:

@article{article3,
Author = {Doe, John},
Title = {{Article 3 name}},
Journal = {{Journal 3 name}},
Year = {{2021}},
Volume = {{1}},
Pages = {{1-2}},
}

The knit output:

However, I'm rather looking after the following output:

Please note that I don't want in-text citations but rather the whole bibliographies listed, which is why I approached the problem by adding the "nocite: '@*'" to the code, but I couldn't get the result I'm after.

By the way, I used the csl style vancouver.csl (please see: https://www.zotero.org/styles?q=vancouver) here.

Any help is greatly appreciated.

Solution

You could use biblatex to split the bibliographies:

---
title: 'John Doe'
output: 
  pdf_document:
    keep_tex: true
csl: vancouver.csl
header-includes:
  - \include{preamble.tex}
---

with preamble.tex:

\usepackage[style=vancouver]{biblatex}
\addbibresource{bib1.bib}
\addbibresource{bib2.bib}

\DeclareSourcemap{
  \maps[datatype=bibtex]{
    \map[overwrite]{
      \perdatasource{bib1.bib}
      \step[fieldset=keywords, fieldvalue={,peer}, append]
    }
  }
}

\AtEndDocument{\nocite{*}
\printbibliography[keyword={peer},title={Peer-reviewed publications}]
\DeclareFieldFormat{labelnumber}{%
  \ifinteger{#1}
    {\number\numexpr#1-2\relax}
    {#1}}
\printbibliography[notkeyword={peer},title={Other publications}]}

And then compile the resulting filename.tex file with

pdflatex filename
biber filename
pdflatex filename