floating-nvim-rhelp
Use 'K' to open a floating window displaying the R help pages for the word under the cursor.
Copy the syntax files into a "syntax" directory in your runtimepath (e.g. ~/.config/nvim/syntax) and source the floating-rhelp.vim file from your vimrc.
Add the following mapping to your vimrc:
" map K to call Rhelp
autocmd FileType r,rmd,rnoweb,quarto nnoremap <silent> <buffer> K :setlocal iskeyword=@,48-57,_,.,:<cr>yiw:setlocal iskeyword=@,48-57,_,.<cr>:call Rhelp(@")<cr>