Create a custom field relationship to list(s)

{
	"fieldRel": {
		"field": 8,
		"relid": 2
	}
}
{
    "fieldRel": {
        "relid": 2,
        "field": 8,
        "cdate": "2019-02-01T08:39:25-06:00",
        "links": [],
        "id": "19"
    }
}
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