yarn add @substrate/txwrapper-orml

In a JS/TS index file of package:

import { methods as ORMLMethods } from '@substrate/txwrapper-orml';

// Export methods of pallets included in the chain
export const methods = {
	currencies: ORMLMethods.currencies,
  ...
};

Have a look at the txwrapper creation guide for chain builders to see more guidance on how to use this package in a chain specific txwrapper.