$ref can't be saved in firebase as a key because it contains '$' about json-schema-editor HOT 3 CLOSED

{
    "type": "object",
    "properties": {
        "member": {
            "oneOf": [
                {
                    "$ref": "repository://IPv4 Address"
                },
                {
                    "$ref": "repository://IPv6 Address"
                }
            ]
        },
        "Port": {
            "$ref": "repository://Port"
        }
    },
    "title": "PoolMember",
    "description": "Pool Member"
}