How to extract tuple from array of objects for Zod enums?

export const PLANS = [
  {
    id: "0",
    name: "free",
    price: 0,
    description: "Free Video Stream",
  },
  {
    id: "price_1Nd",
    name: "basic",
    price: 5,
    description: "Basic Video Stream",
  },
  {
    id: "price_1Nd",
    name: "standard",
    price: 10,
    description: "Standard Video Stream",
  },
  {
    id: "price_1Nd",
    name: "premium",
    price: 20,
    description: "Premium Video Stream",
  },
] as const

const planNames = PLANS.map((plan) => plan.name)
// ("free" | "basic" | "standard" | "premium")[] what I get
// ["free", "basic", "standard", "premium"] what I want

  z.object({
    stripeProductId: z.string(),
    planName: z.enum(["free", "basic", "standard", "premium"]),
  }),