How to return record of specific type?

It’s good practice to put such record types into their own modules, then you can qualify the module where the record comes from after the opening curly brace:

e.g.:

module Opt = {
  type t = {label: string, value: string}
}

type props = {label?: string, value?: string, data: array<Opt.t>}

let make = (props: props) => {
  let opt = {Opt.label: "123", value: "abc"}
  opt
}