In MLflow Helm chart from Bitnami, I saw external S3 section:

## @section External S3 parameters
## All of these values are only used when minio.enabled is set to false
## @param externalS3.host External S3 host
## @param externalS3.port External S3 port number
## @param externalS3.useCredentialsInSecret Whether to use a secret to store the S3 credentials
## @param externalS3.accessKeyID External S3 access key ID
## @param externalS3.accessKeySecret External S3 access key secret
## @param externalS3.existingSecret Name of an existing secret resource containing the S3 credentials
## @param externalS3.existingSecretAccessKeyIDKey Name of an existing secret key containing the S3 access key ID
## @param externalS3.existingSecretKeySecretKey Name of an existing secret key containing the S3 access key secret
## @param externalS3.protocol External S3 protocol
## @param externalS3.bucket External S3 bucket
## @param externalS3.serveArtifacts Whether artifact serving is enabled
##
externalS3:
  host: ""
  port: 443
  useCredentialsInSecret: true
  accessKeyID: ""
  accessKeySecret: ""
  existingSecret: ""
  existingSecretAccessKeyIDKey: "root-user"
  existingSecretKeySecretKey: "root-password"
  protocol: "https"
  bucket: "mlflow"
  serveArtifacts: true

I expect S3 only needs accessKeyID and accessKeySecret.

Why does S3 have host and port?