storeExample.js

const EnumStatus = {
  LOADED: 'LOADED',
  LOADING: 'LOADING',
  FAILED: 'FAILED'
}

const state = {
  subState_1: {
    data: any,
    status: EnumStatus
  },
  subState_2: {
    data: any,
    status: EnumStatus
  },
  ...
}