有没有办法使用terraform将IAM Bucket Policy语句附加到现有语句中？

data "aws_iam_policy_document" "existing_policy" {
  statement {
    sid       = "ExistingStatement"
    effect    = "Allow"
    actions   = ["s3:GetObject"]
    resources = ["arn:aws:s3:::my-bucket/*"]
  }
}

resource "aws_s3_bucket_policy" "bucket_policy" {
  bucket = "my-bucket"

  policy = data.aws_iam_policy_document.existing_policy.json

  statement {
    sid       = "NewStatement"
    effect    = "Allow"
    actions   = ["s3:PutObject"]
    resources = ["arn:aws:s3:::my-bucket/*"]
    principals {
      type        = "AWS"
      identifiers = ["arn:aws:iam::123456789012:user/my-user"]
    }
  }
}