Create a circumvention map json

On a fast look into OONI and the state-of-censorship.json this is what I can come up with:

{
    "by": {
        "settings": [
            {"bridges": {"type": "obfs4",     "source": "builtin"}},
            {"bridges": {"type": "vanilla",   "source": "bridgedb"}},
            {"bridges": {"type": "obfs4",     "source": "bridgedb"}},
            {"bridges": {"type": "snowflake", "source": "builtin"}}
        ]
    },
    "cn": {
        "settings": [
            {"bridges": {"type": "snowflake", "source": "builtin"}}
        ]
    },
    "tm": {
        "settings": [
            {"bridges": {"type": "obfs4",     "source": "bridgedb"}},
            {"bridges": {"type": "snowflake", "source": "builtin"}}
        ]
    },
    "ru": {
        "settings": [
            {"bridges": {"type": "snowflake", "source": "builtin"}},
            {"bridges": {"type": "obfs4",     "source": "bridgedb"}}
        ]
    }
}