I usually skip the get option builtin, and use : as...

while : ; do case "$1" in "") break;; -f|-foo) shift; whatever;; *) usage; exit 1;; esac done

For this... instead

  if something; then 
     true
  else
     echo ERROR
     exit 1
  fi 

For anything else including json etc. I usually go to duckdb. Awesome support, single file install, readable, easy to maintain.

Powershell on Linux or Unix? Just another huge dependency if you manage 1000s of machines, and good luck finding a Linux gal/guy wanting or able to touch pwsh without chemical grade gloves.