在terraform中，如何为map使用传入的变量？

variable "my_map" {
  type = map
  default = {
    key1 = "value1"
    key2 = "value2"
  }
}

resource "aws_instance" "example" {
  ami           = "ami-0c94855ba95c71c99"
  instance_type = "t2.micro"

  tags = var.my_map
}

terraform apply -var="my_map={key1=\"value1\", key2=\"value2\"}"