Using existing enum/const to build a type

Hi folks.
I'm very new to arktype so maybe I'm asking something very simple.
I have a pseudo enum in a third-party module I import.

This const is defined as:
export declare const VoiceId: {
    readonly Aditi: "Aditi";
    readonly Adriano: "Adriano";
    readonly Amy: "Amy";
    // ...


How can I build an ark type from it?
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