I want to dearmor a gpg key only if that gpg key is enarmored.

Here is the enarmor and dearmor:

https://manpages.ubuntu.com/manpages/jammy/man1/gpg.1.html

--enarmor
--dearmor
      Pack or unpack an arbitrary input into/from an OpenPGP  ASCII  armor.   This  is  a
      GnuPG extension to OpenPGP and in general not very useful.
  

Here is the gpg key:

/path/to/gpg/key.gpg

Here is the bash function:

check_and_dearmor() {
    
    if [[ "$(is_enarmored "/path/to/gpg/key.gpg")" == "true" ]]
    then
        echo "gpg is enarmored, dearmor it"
        gpg --dearmor "/path/to/gpg/key.gpg"
    else
        echo "gpg is already dearmored, ignore the gpg --dearmor command"
    fi
    
}

How to implement the “is_enarmored” in bash? Or what command can be used to check if the gpg is enarmored or not?