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you can use your language of choices standard base64 encoding and base the string that way, so in typescript:
`k =&gt; Buffer.from(k).toString("base64")`

```data "template_cloudinit_config" "bastion-config" {
  gzip = true
  base64_encode = true
  part {
    filename = "cloudinit-config.cfg"
    content_type = "text/cloud-config"
    content = data.template_file.cloudinit_config.rendered
  }
  part {
    filename = "bootstrap.sh"
    content_type = "text/x-shellscript"
    content = data.template_file.start_script.rendered
  }
}```

so base64 + gzip multi-part file is. then rendered as userData

`user_data = data.template_cloudinit_config.bastion-config.rendered`