[Question] How to integrate sendgrid into Lemmy-Ansible installation?

I’m using the Lemmy ansible installation method. I’ve been trying to add sendgrid to the postfix section of the config.hjson file on my local machine. But where do I add the API key and username? I used port 587 but nothing works. Can anyone help walk me through how to integrate sendgrid into Lemmy-Ansible? Thanks!!

the email section of config.hjson looks like this, did I do this right?

  email: {
    smtp_server: "smtp.sendgrid.net:587"
    smtp_from_address: "noreply@{{ domain }}"
    tls_type: "tls"
  }

I was able to find the server location on my VPS under srv/lemmy/domain, so I can edit the lemmy.hjson file there if need be.