JSON variables , env variables not able to access

Hi @All,
JSON variables , env variables not able to access. packer version latest

{
“variables”: {
“ssh_pkf”:“${env.PKR_VAR_SSH_PKEY}”
}
}

when validate using packer validate , im facing issue
Error: Variables not allowed

on variables.pkr.json line 3, in variables:
3: “ssh_pkf”:“${env.PKR_VAR_SSH_PKEY}”,

Variables may not be used here.

Any solution would be helpful.

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