GET /v3/instruments/:id/net-asset-values

List NAV observations for a private-market-fund instrument.

Path params:
  id (required) — Instrument identifier (Mongo ObjectID).

Response (200 OK):
{
  "data": [
    {
      "id": "string",
      "type": "net-asset-value",
      "attributes": {
        "officialDate":  "ISO 8601 date",
        "effectiveDate": "ISO 8601 date or null (defaults to officialDate when null)",
        "value":         "number, in fund currency"
      }
    }
  ]
}