Review Suggested Edit

Remapping backspace with Karabiner Elements

I'm using [Karabiner-Elements](https://github.com/pqrs-org/Karabiner-Elements) to remap some keys. 

I would like remap 

- `backspace` to forward delete

- `option` + `backspace` to backward delete

To do this I tried to write the following rule and place the `.json` file in `/Users/<username>/.config/karabiner/assets/complex_modifications`, but the rule does not even show up in rule selection window. 

![rule selection window](https://powerusers.codidact.com/uploads/AcSoV2zjwWrEQBtyLxNxtFyz)

```
{
  "title": "Swap backspace to forward delete",
  "rules": [
    {
      "description": "Backspace to Forward Delete",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "delete_or_backspace",
          },
          "to": [
            {
              "key_code": "delete_forward"
            }
          ]
        }
      ]
    },
    {
      "description": "Option + Backspace to Backspace",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "delete_or_backspace",
            "modifiers": {
              "mandatory":[
                "option"
              ]
            }            
          },
          "to": [
            {
              "key_code": "delete_backwards"
            }
          ]
        }
      ]
    }
  ]
}
```

Is there any syntax error in my rule or why doesn't it show up in the rule window?