Can not generate azurerm provider with no features

[yorinasub17]

// main.tf.json.jsonnet
local tf = import 'github.com/tf-libsonnet/core/main.libsonnet';
local azurerm = import 'github.com/tf-libsonnet/hashicorp-azurerm/main.libsonnet';

azurerm.provider.new(
  features=[{}],
  src='hashicorp/azurerm',
)

generates

{
   "provider": {
      "azurerm": [
         { }
      ]
   },
   "terraform": {
      "required_providers": {
         "azurerm": {
            "source": "hashicorp/azurerm"
         }
      }
   }
}

Not the expected:

{
   "provider": {
      "azurerm": [
         { "features": [{}] }
      ]
   },
   "terraform": {
      "required_providers": {
         "azurerm": {
            "source": "hashicorp/azurerm"
         }
      }
   }
}