using singularity environment for R languageserver

[pirocv]

Hi,

• I am using coc-r-lsp for R language completion in coc.nvim.
• I believe the R environment needs to have the library 'languageserver' installed, but can this be substituted with an R environment inside a Singularity container?
• I have configured ~/.config/nvim/coc-settings.json and r-languageserver-wrapper.sh as follows,

{
  "languageserver": {
    "R": {
      "enable": true,
      "command": "~/r-languageserver-wrapper.sh",
      "filetypes": [
        "r", "R"
      ],
      "trace.server": "verbose"
    }
  }
}

#!/bin/bash
singularity exec ~/r_env.sif R --slave -e "languageserver::run()"

However, when I open R file, nvim test.r I am still encountering errors.

R Language Server (138323) started
Error in loadNamespace(x) : there is no package called ‘languageserver’
Calls: loadNamespace -> withRestarts -> withOneRestart -> doWithOneRestart
Execution halted

R Language Server (138323) exited with exit code 1

Is there a good way to use coc.nvim with the languageserver in R env within a Singularity container?

many thanks,