Is adding a system assigned identity to eventgrid_event_subscription possible?

[SKHolmes]

resource "azurerm_eventgrid_event_subscription" "ev_sub" {
  ***...

  identity = {
    type = "SystemAssigned"
  }
}

I’ve been trying to set up a terraform script to run and basically tick the below box. Is this something that is currently achievable with the terraform providers?