Convert Jupyter Notebooks with R code cells to ```r code cells

[ClemensKohl]

Hi,
I am running Jupyter Notebooks with an R Kernel and when converting these files to Markdow the code cells are converted to code blocks starting with R. However many e.g. neovim plugins such as quarto.nvim and otter.nvim expect code blocks to start with r for e.g. syntax highlighting.
Is there a setting, e.g. a flag, that I can make to ensure that these cells are converted to code blocks starting with ```r?
For reference, here is the metadata from an example notebook:

jupyter:
  jupytext:
    text_representation:
      extension: .md
      format_name: markdown
      format_version: '1.3'
      jupytext_version: 1.16.1
  kernelspec:
    display_name: R 4.2
    language: R
    name: ir42

Thanks a lot for your time and help!