Event bridge rule for specific file in the specific path of S3 bucket

If it's a specific file, I think you can do it like this:

{
  "source": ["aws.s3"],
  "detail-type": ["Object Created"],
  "detail": {
    "bucket": {
      "name": ["s3-bucket-name"]
    },
    "object": {
      "key": [{
        "prefix": "config/remote123.xlsx"
      }]
    }
  }
}

If it is a specific file, you don't even need the prefix: "key": ["config/remote123.xlsx"]