How to inject data/module output into map value

Terraform
1

I have a variable:

variable groupOptions {
  type=map
}

that I use in a for_each dynamic block of an aws_db_option_group resource:

resource "aws_db_option_group" "rdsOptionGroup" {
  name                                 = var.groupName
  option_group_description             = var.groupDescription
  engine_name                          = var.rdsEngine
  major_engine_version                 = var.rdsEngineFamily

  dynamic option {
    for_each                           = var.groupOptions
    content {
      db_security_group_memberships    = option.value.DBSecGrps
      option_name                      = option.value.Name
      port                             = option.value.Port
      version                          = option.value.Version
      vpc_security_group_memberships   = option.value.VPCSecGrps

      dynamic option_settings {
        for_each                       = option.value.Settings
        content {
          name                         = option_settings.value.Name
          value                        = option_settings.value.Value
        }
      }
    }
  }

  tags = merge(
    var.tagsAIG,
    map(
      "Name","${var.groupName}"
    )
  )
}

My terraform.tfvars file fills the rdsOpstions variable like so:

groupOptions = {
  "backup-restore" = {
    "DBSecGrps"                          = []
    "Name"                               = "SQLSERVER_BACKUP_RESTORE"
    "Port"                               = 0
    "Version"                            = ""
    "VPCSecGrps"                         = []
    "Settings" = {
      "iam-role" = {
         "Name"                          = "IAM_ROLE_ARN"
         "Value"                         = "arn:aws:iam::0000000000:role/service-role/my-s3-backup-role"
       }
    }
  }
}

My question is how can I substitue that hard-coded value with the output of a data resource or module, as that name can vary from one env to the next.