JED 1.6.0+ - Center World Border to spawn point

{
    "config_version": {
        "id": "__default",
        "version": 0
    },
    "dimensions": [
        {
            "dim": 123,
            "worldinfo_onetime": {},
            "jed": {
                "WorldBorderCenteredOnSpawn": true,
                "SpawnPointSearchType": {
                    "type": "none"
                }
            }
        }
    ]
}