Method fetchOption

java/lib/src/main/java/io/github/ccxt/exchanges/OkxCore.java:9589–9632

@method @name okx#fetchOption @description fetches option data that is commonly found in an option chain @see https://www.okx.com/docs-v5/en/#order-book-trading-market-data-get-ticker @param {string} symbol unified market symbol @param {object} [params] extra parameters specific to the exchange API

(Object symbol, Object... optionalArgs)

     * @returns {object} an [option chain structure]{@link https://docs.ccxt.com/?id=option-chain-structure}
     */
    public java.util.concurrent.CompletableFuture<Object> fetchOption(Object symbol, Object... optionalArgs)
    {

        return java.util.concurrent.CompletableFuture.supplyAsync(() -> {

            Object parameters = Helpers.getArg(optionalArgs, 0, new java.util.HashMap<String, Object>() {{}});
            (this.loadMarkets()).join();
            Object market = this.market(symbol);
            Object request = new java.util.HashMap<String, Object>() {{
                put( "instId", Helpers.GetValue(market, "id") );
            }};
            Object response = (this.publicGetMarketTicker(this.extend(request, parameters))).join();
            //
            //     {
            //         "code": "0",
            //         "msg": "",
            //         "data": [
            //             {
            //                 "instType": "OPTION",
            //                 "instId": "BTC-USD-241227-60000-P",
            //                 "last": "",
            //                 "lastSz": "0",
            //                 "askPx": "",
            //                 "askSz": "0",
            //                 "bidPx": "",
            //                 "bidSz": "0",
            //                 "open24h": "",
            //                 "high24h": "",
            //                 "low24h": "",
            //                 "volCcy24h": "0",
            //                 "vol24h": "0",
            //                 "ts": "1711176035035",
            //                 "sodUtc0": "",
            //                 "sodUtc8": ""
            //             }
            //         ]
            //     }
            //
            Object result = this.safeList(response, "data", new java.util.ArrayList<Object>(java.util.Arrays.asList()));
            Object chain = this.safeDict(result, 0, new java.util.HashMap<String, Object>() {{}});
            return this.parseOption(chain, null, market);
        });

    }

    /**
     * @method