In Indicators this is the options object on param, input, output, box, and segment: every optional setting of a declaration is a named field of its last argument (param("period", 20, { min: 1, max: 200, description: "Lookback" }), input("btc", ohlcv.close, { symbol: "BTCUSDT", exchange: "BINANCE_FUTURES" }), box("zone", { top: hi, bottom: lo, when: gate, opacity: 0.15 })), in any order, self-documenting, with an unknown field refused by name at build time.
The nearest form for calls is positional: TA classes and your own functions take arguments in declared order, and a function with many settings takes a class instance instead of a keyword list.
The full option list per declaration is in Script definition.
What stays on kScript (legacy): keyword calls on builtins and user functions (sma(source=closeTs, period=20)), and mixing positional and keyword arguments in one call.