FN+WASD -> Arrow Keys (Simple key caps_lock to fn)

karabiner-elements.fn-wasd-to-arrow-keys.json

                    {
                        "description": "caps_lock + w,a,s,d to arrow_keys",
                        "manipulators": [
                            {
                                "from": {
                                    "key_code": "w",
                                    "modifiers": {
                                        "mandatory": [
                                            "fn"
                                        ],
                                        "optional": [
                                            "any"
                                        ]
                                    }
                                },
                                "to": [
                                    {
                                        "key_code": "up_arrow"
                                    }
                                ],
                                "type": "basic"
                            },
                            {
                                "from": {
                                    "key_code": "a",
                                    "modifiers": {
                                        "mandatory": [
                                            "fn"
                                        ],
                                        "optional": [
                                            "any"
                                        ]
                                    }
                                },
                                "to": [
                                    {
                                        "key_code": "left_arrow"
                                    }
                                ],
                                "type": "basic"
                            },
                            {
                                "from": {
                                    "key_code": "d",
                                    "modifiers": {
                                        "mandatory": [
                                            "fn"
                                        ],
                                        "optional": [
                                            "any"
                                        ]
                                    }
                                },
                                "to": [
                                    {
                                        "key_code": "right_arrow"
                                    }
                                ],
                                "type": "basic"
                            },
                            {
                                "from": {
                                    "key_code": "s",
                                    "modifiers": {
                                        "mandatory": [
                                            "fn"
                                        ],
                                        "optional": [
                                            "any"
                                        ]
                                    }
                                },
                                "to": [
                                    {
                                        "key_code": "down_arrow"
                                    }
                                ],
                                "type": "basic"
                            }
                        ]
                    }