Access property of secret without saving it to a variable first?

I do this to use a secret:

  newRelicLicenseSecret: ${ssm:/aws/reference/secretsmanager/NEW_RELIC_LICENSE_KEY~true}
  newRelic:
    accountId: ${self:custom.newRelicLicenseSecret.NrAccountId}

Is there some syntax that would allow me to access NrAccountId in newRelic.accountId without having to declare newRelicLicenseSecret?