My use case required immediate fixed values to pass.

f() {
  declare -A map=$1
  for key in ${!map[@]}
  do
    echo "$key : ${map[$key]}"
  done
}

This correctly produces:

# f '(["key 1"]="value 1" ["key 2"]="value 2")'
key 2 : value 2
key 1 : value 1